diff --git a/demo/js/case/tree/demo.branch_tree.js b/demo/js/case/tree/demo.branch_tree.js
index 76d1ad7ba..91b9bd69f 100644
--- a/demo/js/case/tree/demo.branch_tree.js
+++ b/demo/js/case/tree/demo.branch_tree.js
@@ -72,7 +72,7 @@ Demo.Func = BI.inherit(BI.Widget, {
         var tree = BI.createWidget({
             type: "bi.branch_tree",
             el: {
-                type: "bi.button_group"
+                type: "bi.virtual_group"
             },
             items: [{
                 text: "且",
@@ -159,8 +159,8 @@ Demo.Func = BI.inherit(BI.Widget, {
                         type: "bi.label",
                         height: 30,
                         textAlign: "left",
-                        text: "这里是一段文字" + BI.UUID(),
-                        value: "这里是一段文字" + BI.UUID()
+                        text: "这里是一段文字" ,
+                        value: "这里是一段文字"
                     }, {
                         text: "且",
                         value: "且3",
diff --git a/demo/js/config/core.js b/demo/js/config/core.js
index 6d83a0f9b..757617793 100644
--- a/demo/js/config/core.js
+++ b/demo/js/config/core.js
@@ -91,8 +91,8 @@ Demo.CORE_CONFIG = [{
     value: "demo.button_tree"
 }, {
     pId: 102,
-    text: "bi.button_map",
-    value: "demo.button_map"
+    text: "bi.virtual_group",
+    value: "demo.virtual_group"
 }, {
     pId: 102,
     id: 10201,
diff --git a/demo/js/core/abstract/demo.button_map.js b/demo/js/core/abstract/demo.button_map.js
deleted file mode 100644
index f3e76f2f5..000000000
--- a/demo/js/core/abstract/demo.button_map.js
+++ /dev/null
@@ -1,26 +0,0 @@
-Demo.Func = BI.inherit(BI.Widget, {
-    props: {
-        baseCls: "demo-func"
-    },
-    render: function () {
-        return {
-            type: "bi.button_map",
-            chooseType: BI.ButtonGroup.CHOOSE_TYPE_MULTI,
-            layouts: [{
-                type: "bi.vertical"
-            }, {
-                type: "bi.center_adapt",
-            }],
-            items: [{
-                type: "bi.label",
-                text: "0",
-                value: 0
-            }, {
-                type: "bi.button",
-                text: "1",
-                value: 1
-            }]
-        }
-    }
-});
-$.shortcut("demo.button_map", Demo.Func);
\ No newline at end of file
diff --git a/demo/js/core/abstract/demo.virtual_group.js b/demo/js/core/abstract/demo.virtual_group.js
new file mode 100644
index 000000000..0c746cffa
--- /dev/null
+++ b/demo/js/core/abstract/demo.virtual_group.js
@@ -0,0 +1,74 @@
+Demo.Func = BI.inherit(BI.Widget, {
+    props: {
+        baseCls: "demo-func"
+    },
+
+    _createItems: function () {
+        var items = BI.makeArray(100, {
+            type: "demo.virtual_group_item"
+        });
+        items[0].value = BI.UUID();
+        return items;
+    },
+
+    render: function () {
+        var self = this;
+        return {
+            type: "bi.vertical",
+            vgap: 20,
+            items: [{
+                type: "bi.virtual_group",
+                width: 200,
+                height: 300,
+                ref: function () {
+                    self.buttonMap = this;
+                },
+                chooseType: BI.ButtonGroup.CHOOSE_TYPE_MULTI,
+                layouts: [{
+                    type: "bi.vertical"
+                }, {
+                    type: "bi.center_adapt",
+                }],
+                items: this._createItems()
+            }, {
+                type: "bi.button",
+                text: "点击刷新",
+                handler: function () {
+                    self.buttonMap.populate(self._createItems());
+                }
+            }]
+
+        }
+    }
+});
+$.shortcut("demo.virtual_group", Demo.Func);
+
+Demo.Item = BI.inherit(BI.Widget, {
+    props: {
+        baseCls: "demo-item",
+        height: 30
+    },
+
+    render: function () {
+        var self = this;
+        return {
+            type: "bi.label",
+            ref: function () {
+                self.label = this;
+            },
+            height: this.options.height,
+            text: "这是一个测试项" + BI.UUID()
+        }
+    },
+
+    update: function (item) {
+        this.label.setText(item.value);
+        console.log("更新了一项");
+        return true;
+    },
+
+    created: function () {
+        console.log("创建了一项");
+    }
+});
+$.shortcut("demo.virtual_group_item", Demo.Item);
\ No newline at end of file
diff --git a/dist/base.js b/dist/base.js
index 345bc1725..9acaf99f9 100644
--- a/dist/base.js
+++ b/dist/base.js
@@ -1129,11 +1129,12 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
     },
 
     populate: function (items) {
-        this.options.items = items || [];
+        items = items || [];
+        this.options.items = items;
         this.empty();
 
         this.buttons = this._btnsCreator.apply(this, arguments);
-        var items = this._packageItems(items, this._packageBtns(this.buttons));
+        items = this._packageItems(items, this._packageBtns(this.buttons));
 
         this.layouts = BI.createWidget(BI.extend({element: this}, this._packageLayout(items)));
     },
@@ -1454,120 +1455,6 @@ BI.ButtonTree = BI.inherit(BI.ButtonGroup, {
 BI.ButtonTree.EVENT_CHANGE = "EVENT_CHANGE";
 
 $.shortcut("bi.button_tree", BI.ButtonTree);/**
- * value作为key值缓存button，  不支持顺序读写
- * 适合用于频繁增删的一组button
- * Created by GUY on 2015/8/10.
- * @class BI.ButtonMap
- * @extends BI.ButtonTree
- */
-
-BI.ButtonMap = BI.inherit(BI.ButtonTree, {
-    _defaultConfig: function () {
-        return BI.extend(BI.ButtonMap.superclass._defaultConfig.apply(this, arguments), {
-            baseCls: "bi-button-map"
-        })
-    },
-
-    _init: function () {
-        BI.ButtonMap.superclass._init.apply(this, arguments);
-    },
-
-    _createBtns: function (items) {
-        var self = this, o = this.options;
-        var buttons = BI.createWidgets(BI.createItems(items, {type: "bi.text_button", once: o.chooseType === 0}));
-        var keys = BI.map(items, function (i, item) {
-            item = BI.stripEL(item);
-            if (!(BI.isKey(item.id) || BI.isKey(item.value))) {
-                throw new Error("item必须包含id或value属性");
-            }
-            return item.id || item.value;
-        });
-        return BI.object(keys, buttons);
-    },
-
-    setValue: function (v) {
-        var self = this;
-        v = BI.isArray(v) ? v : [v];
-        BI.each(this.buttons, function (val, item) {
-            if (!BI.isFunction(item.setSelected)) {
-                item.setValue(v);
-                return;
-            }
-            if (v.contains(val)) {
-                item.setSelected && item.setSelected(true);
-            } else {
-                item.setSelected && item.setSelected(false);
-            }
-        });
-    },
-
-    setNotSelectedValue: function (v) {
-        var self = this;
-        v = BI.isArray(v) ? v : [v];
-        BI.each(this.buttons, function (val, item) {
-            if (!BI.isFunction(item.setSelected)) {
-                item.setNotSelectedValue(v);
-                return;
-            }
-            if (v.contains(val)) {
-                item.setSelected && item.setSelected(false);
-            } else {
-                item.setSelected && item.setSelected(true);
-            }
-        });
-    },
-
-    populate: function (items) {
-        var self = this;
-        var args = [].slice.call(arguments);
-        var linkHashMap = new BI.LinkHashMap();
-        var val = function (item) {
-            return item.id || item.value;
-        };
-        if (!this.buttons) {
-            this.buttons = {};
-        }
-        //所有已存在的和新添加的
-        var willCreated = [];
-        BI.each(items, function (i, item) {
-            item = BI.stripEL(item);
-            if (self.buttons[val(item)]) {
-                var ob = self.buttons[val(item)];
-                args[0] = item.items;
-                args[2] = item;
-                ob.populate && ob.populate.apply(ob, args);
-            } else {
-                willCreated.push(item);
-            }
-        });
-        //创建新元素
-        args[0] = willCreated;
-        var newBtns = this._btnsCreator.apply(this, args);
-
-        //整理
-        var array = [];
-        BI.each(items, function (i, item) {
-            item = BI.stripEL(item);
-            var button = self.buttons[val(item)] || newBtns[val(item)];
-            linkHashMap.add(val(item), button);
-            array.push(button);
-        });
-        this.buttons = linkHashMap.map;
-
-        BI.DOM.hang(this.buttons);
-        this.empty();
-
-        var packages = this._packageItems(items, this._packageBtns(array));
-        BI.createWidget(BI.extend({element: this}, this._packageLayout(packages)));
-    },
-
-    getIndexByValue: function (value) {
-        throw new Error("不能使用getIndexByValue方法");
-    }
-});
-BI.ButtonMap.EVENT_CHANGE = "EVENT_CHANGE";
-
-$.shortcut("bi.button_map", BI.ButtonMap);/**
  * guy
  * 异步树
  * @class BI.TreeView
@@ -3665,7 +3552,75 @@ BI.ComboGroup = BI.inherit(BI.Widget, {
 });
 BI.ComboGroup.EVENT_CHANGE = "EVENT_CHANGE";
 
-$.shortcut("bi.combo_group", BI.ComboGroup);/**
+$.shortcut("bi.combo_group", BI.ComboGroup);BI.VirtualGroup = BI.inherit(BI.Widget, {
+    _defaultConfig: function () {
+        return BI.extend(BI.VirtualGroup.superclass._defaultConfig.apply(this, arguments), {
+            baseCls: "bi-virtual-group",
+            items: [],
+            layouts: [{
+                type: "bi.center",
+                hgap: 0,
+                vgap: 0
+            }]
+        })
+    },
+
+    render: function () {
+        this.populate(this.options.items);
+    },
+
+    _createBtns: function (items) {
+        var o = this.options;
+        return BI.createItems(items, {
+            type: "bi.text_button"
+        });
+    },
+
+    _packageBtns: function (btns) {
+        var o = this.options;
+
+        for (var i = o.layouts.length - 1; i > 0; i--) {
+            btns = BI.map(btns, function (k, it) {
+                return BI.extend({}, o.layouts[i], {
+                    items: [
+                        BI.extend({}, o.layouts[i].el, it)
+                    ]
+                })
+            })
+        }
+        return btns;
+    },
+
+    _packageItems: function (items, packBtns) {
+        return BI.createItems(BI.makeArrayByArray(items, {}), BI.clone(packBtns));
+    },
+
+    _packageLayout: function (items) {
+        var o = this.options, layout = BI.deepClone(o.layouts[0]);
+
+        var lay = BI.formatEL(layout).el;
+        while (lay && lay.items && !BI.isEmpty(lay.items)) {
+            lay = BI.formatEL(lay.items[0]).el;
+        }
+        lay.items = items;
+        return layout;
+    },
+
+    populate: function (items) {
+        var self = this;
+        items = items || [];
+        this.options.items = items;
+        items = this._packageItems(items, this._packageBtns(this._createBtns(items)));
+        if (!this.layouts) {
+            this.layouts = BI.createWidget(BI.extend({element: this}, this._packageLayout(items)));
+        } else {
+            this.layouts.populate(this._packageLayout(items).items);
+        }
+    }
+});
+BI.VirtualGroup.EVENT_CHANGE = "EVENT_CHANGE";
+
+$.shortcut("bi.virtual_group", BI.VirtualGroup);/**
  * 加载控件
  *
  * Created by GUY on 2015/8/31.
diff --git a/dist/core.js b/dist/core.js
index f21704bf5..0977f781f 100644
--- a/dist/core.js
+++ b/dist/core.js
@@ -14342,6 +14342,10 @@ BI.Widget = BI.inherit(BI.OB, {
 
     },
 
+    update: function () {
+
+    },
+
     destroyed: function () {
     },
 
@@ -14666,10 +14670,7 @@ BI.Widget = BI.inherit(BI.OB, {
     },
 
     destroy: function () {
-        this.empty();
-        this._isMounted = false;
-        this._parent = null;
-        this.destroyed();
+        this._unMount();
         this.element.destroy();
         this.fireEvent(BI.Events.DESTROY);
     }
@@ -19320,35 +19321,117 @@ BI.Layout = BI.inherit(BI.Widget, {
         }
     },
 
+    _getChildName: function (index) {
+        return index + "";
+    },
+
     _addElement: function (i, item) {
-        var o = this.options;
-        var w;
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        var self = this, w;
+        if (!this.hasWidget(this._getChildName(i))) {
             w = BI.createWidget(item);
-            this.addWidget(this.getName() + "-" + i, w);
+            this.addWidget(this._getChildName(i), w);
+            w.on(BI.Events.DESTROY, function () {
+                BI.each(self._children, function (name, child) {
+                    if (child === w) {
+                        self.removeItemAt(name | 0);
+                    }
+                });
+            });
         } else {
-            w = this.getWidgetByName(this.getName() + "-" + i);
+            w = this.getWidgetByName(this._getChildName(i));
         }
         return w;
     },
 
-    stroke: function (items) {
+    _getOptions: function (item) {
+        if (item instanceof BI.Widget) {
+            item = item.options;
+        }
+        item = BI.stripEL(item);
+        if (item instanceof BI.Widget) {
+            item = item.options;
+        }
+        return item;
+    },
+
+    _compare: function (item1, item2) {
         var self = this;
-        BI.each(items, function (i, item) {
-            if (!!item) {
-                self._addElement(i, item);
+        return eq(item1, item2);
+
+        //不比较函数
+        function eq(a, b, aStack, bStack) {
+            if (a === b) return a !== 0 || 1 / a === 1 / b;
+            if (a == null || b == null) return a === b;
+            var className = Object.prototype.toString.call(a);
+            switch (className) {
+                case '[object RegExp]':
+                case '[object String]':
+                    return '' + a === '' + b;
+                case '[object Number]':
+                    if (+a !== +a) return +b !== +b;
+                    return +a === 0 ? 1 / +a === 1 / b : +a === +b;
+                case '[object Date]':
+                case '[object Boolean]':
+                    return +a === +b;
+            }
+
+            var areArrays = className === '[object Array]';
+            if (!areArrays) {
+                if (BI.isFunction(a) && BI.isFunction(b)) {
+                    return true;
+                }
+                a = self._getOptions(a);
+                b = self._getOptions(b);
             }
-        });
+
+            aStack = aStack || [];
+            bStack = bStack || [];
+            var length = aStack.length;
+            while (length--) {
+                if (aStack[length] === a) return bStack[length] === b;
+            }
+
+            aStack.push(a);
+            bStack.push(b);
+
+            if (areArrays) {
+                length = a.length;
+                if (length !== b.length) return false;
+                while (length--) {
+                    if (!eq(a[length], b[length], aStack, bStack)) return false;
+                }
+            } else {
+                var keys = _.keys(a), key;
+                length = keys.length;
+                if (_.keys(b).length !== length) return false;
+                while (length--) {
+                    key = keys[length];
+                    if (!(_.has(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
+                }
+            }
+            aStack.pop();
+            bStack.pop();
+            return true;
+        }
     },
 
-    populate: function (items) {
-        var self = this;
-        this.options.items = items || [];
-        this.stroke(items);
+    _getWrapper: function () {
+        return this.element;
     },
 
-    resize: function () {
+    _addItem: function (index, item) {
+        for (var i = this.options.items.length; i > index; i--) {
+            this._children[this._getChildName(i)] = this._children[this._getChildName(i - 1)];
+        }
+        delete this._children[index];
+        this.options.items.splice(index, 0, item);
+    },
 
+    _removeItem: function (index) {
+        for (var i = index; i < this.options.items.length - 1; i++) {
+            this._children[this._getChildName(i)] = this._children[this._getChildName(i + 1)];
+        }
+        this.options.items.splice(index, 1);
     },
 
     /**
@@ -19358,7 +19441,7 @@ BI.Layout = BI.inherit(BI.Widget, {
     addItem: function (item) {
         var w = this._addElement(this.options.items.length, item);
         this.options.items.push(item);
-        w.element.appendTo(this.element);
+        w.element.appendTo(this._getWrapper());
         w._mount();
         return w;
     },
@@ -19366,11 +19449,54 @@ BI.Layout = BI.inherit(BI.Widget, {
     prependItem: function (item) {
         var w = this._addElement(this.options.items.length, item);
         this.options.items.unshift(item);
-        w.element.prependTo(this.element);
+        w.element.prependTo(this._getWrapper());
         w._mount();
         return w;
     },
 
+    addItemAt: function (index, item) {
+        if (index < 0 || index > this.options.items.length) {
+            return;
+        }
+        this._addItem(index, item);
+        var w = this._addElement(index, item);
+        if (index > 0) {
+            this._children[this._getChildName(index - 1)].element.after(w.element);
+        } else {
+            w.element.prependTo(this._getWrapper());
+        }
+        w._mount();
+        return w;
+    },
+
+    removeItemAt: function (index) {
+        if (index < 0 || index > this.options.items.length - 1) {
+            return;
+        }
+        this._children[this._getChildName(index)].destroy();
+        this._removeItem(index);
+    },
+
+    updateItemAt: function (index, item) {
+        if (index < 0 || index > this.options.items.length - 1) {
+            return;
+        }
+
+        var updated;
+        if (updated = this._children[this._getChildName(index)].update(this._getOptions(item))) {
+            return updated;
+        }
+        this._children[this._getChildName(index)].destroy();
+        var w = this._addElement(index, item);
+        this._children[this._getChildName(index)] = w;
+        if (index > 0) {
+            this._children[this._getChildName(index - 1)].element.after(w.element);
+        } else {
+            w.element.prependTo(this._getWrapper());
+        }
+        w._mount();
+    },
+
     addItems: function (items) {
         var self = this;
         BI.each(items, function (i, item) {
@@ -19386,9 +19512,9 @@ BI.Layout = BI.inherit(BI.Widget, {
     },
 
     getValue: function () {
-        var value = [];
-        BI.each(this._children, function (i, wi) {
-            var v = wi.getValue();
+        var self = this, value = [];
+        BI.each(this.options.items, function (i) {
+            var v = self._children[self._getChildName(i)].getValue();
             v = BI.isArray(v) ? v : [v];
             value = value.concat(v);
         });
@@ -19396,15 +19522,63 @@ BI.Layout = BI.inherit(BI.Widget, {
     },
 
     setValue: function (v) {
-        BI.each(this._children, function (i, wi) {
-            wi.setValue(v);
+        var self = this;
+        BI.each(this.options.items, function (i) {
+            self._children[self._getChildName(i)].setValue(v);
         })
     },
 
     setText: function (v) {
-        BI.each(this._children, function (i, wi) {
-            wi.setText(v);
+        var self = this;
+        BI.each(this.options.items, function (i) {
+            self._children[self._getChildName(i)].setText(v);
         })
+    },
+
+    update: function (item) {
+        var o = this.options;
+        var items = item.items;
+        var updated = false, i, len;
+        for (i = 0, len = o.items.length; i < len; i++) {
+            if (!this._compare(o.items[i], items[i])) {
+                updated = this.updateItemAt(i, items[i]) || updated;
+            }
+        }
+        if (o.items.length > items.length) {
+            for (i = items.length; i < o.items.length; i++) {
+                this.removeItemAt(i);
+            }
+        } else if (items.length > o.items.length) {
+            for (i = o.items.length; i < items.length; i++) {
+                this.addItemAt(i, items[i]);
+            }
+        }
+        this.options.items = items;
+        return updated;
+    },
+
+    stroke: function (items) {
+        var self = this;
+        BI.each(items, function (i, item) {
+            if (!!item) {
+                self._addElement(i, item);
+            }
+        });
+    },
+
+    populate: function (items) {
+        var self = this, o = this.options;
+        items = items || [];
+        if (this._isMounted) {
+            this.update({items: items});
+            return;
+        }
+        this.options.items = items;
+        this.stroke(items);
+    },
+
+    resize: function () {
+
     }
 });
 $.shortcut('bi.layout', BI.Layout);/**
@@ -24978,7 +25152,7 @@ BI.CenterAdaptLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "top": "0", "left": "0", "margin": "0px auto"});
             td = BI.createWidget({
@@ -24989,9 +25163,9 @@ BI.CenterAdaptLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + "-" + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + "-" + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
         td.element.css({"max-width": o.columnSize[i]});
@@ -25049,20 +25223,8 @@ BI.CenterAdaptLayout = BI.inherit(BI.Layout, {
         // console.log("center_adapt布局不需要resize");
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$tr;
     },
 
     populate: function (items) {
@@ -25108,7 +25270,7 @@ BI.HorizontalAdaptLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "top": "0", "left": "0", "margin": "0px auto"});
             td = BI.createWidget({
@@ -25119,9 +25281,9 @@ BI.HorizontalAdaptLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + "-" + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + "-" + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
         td.element.css({"max-width": o.columnSize[i] + "px"});
@@ -25178,20 +25340,8 @@ BI.HorizontalAdaptLayout = BI.inherit(BI.Layout, {
         // console.log("horizontal_adapt布局不需要resize");
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
+    _getWrapper: function () {
+        return this.$tr;
     },
 
     populate: function (items) {
@@ -25406,7 +25556,7 @@ BI.VerticalAdaptLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "top": "0", "left": "0", "margin": "0px auto"});
             td = BI.createWidget({
@@ -25417,9 +25567,9 @@ BI.VerticalAdaptLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + "-" + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + "-" + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
 
@@ -25473,20 +25623,8 @@ BI.VerticalAdaptLayout = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$tr;
     },
 
     resize: function () {
@@ -26063,20 +26201,8 @@ BI.FlexCenterLayout = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$wrapper;
     },
 
     resize: function () {
@@ -26160,20 +26286,8 @@ BI.FlexHorizontalLayout = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$wrapper;
     },
 
     resize: function () {
@@ -26255,20 +26369,8 @@ BI.FlexVerticalCenter = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$wrapper;
     },
 
     resize: function () {
@@ -27275,7 +27377,7 @@ BI.HorizontalLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "margin": "0px auto"});
             td = BI.createWidget({
@@ -27286,9 +27388,9 @@ BI.HorizontalLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
 
@@ -27346,12 +27448,8 @@ BI.HorizontalLayout = BI.inherit(BI.Layout, {
         // console.log("horizontal layout do not need to resize");
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        w._mount();
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        return w;
+    _getWrapper: function(){
+        return this.$tr;
     },
 
     populate: function (items) {
@@ -27522,6 +27620,12 @@ BI.LatticeLayout = BI.inherit(BI.Layout, {
         return w;
     },
 
+    addItemAt: function (item) {
+        var w = BI.LatticeLayout.superclass.addItemAt.apply(this, arguments);
+        this.resize();
+        return w;
+    },
+
     resize: function () {
         this.stroke(this.options.items);
     },
diff --git a/src/base/combination/group.button.js b/src/base/combination/group.button.js
index abe2310bc..c406acffb 100644
--- a/src/base/combination/group.button.js
+++ b/src/base/combination/group.button.js
@@ -166,11 +166,12 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
     },
 
     populate: function (items) {
-        this.options.items = items || [];
+        items = items || [];
+        this.options.items = items;
         this.empty();
 
         this.buttons = this._btnsCreator.apply(this, arguments);
-        var items = this._packageItems(items, this._packageBtns(this.buttons));
+        items = this._packageItems(items, this._packageBtns(this.buttons));
 
         this.layouts = BI.createWidget(BI.extend({element: this}, this._packageLayout(items)));
     },
diff --git a/src/base/combination/group.virtual.js b/src/base/combination/group.virtual.js
new file mode 100644
index 000000000..3f4de579d
--- /dev/null
+++ b/src/base/combination/group.virtual.js
@@ -0,0 +1,69 @@
+BI.VirtualGroup = BI.inherit(BI.Widget, {
+    _defaultConfig: function () {
+        return BI.extend(BI.VirtualGroup.superclass._defaultConfig.apply(this, arguments), {
+            baseCls: "bi-virtual-group",
+            items: [],
+            layouts: [{
+                type: "bi.center",
+                hgap: 0,
+                vgap: 0
+            }]
+        })
+    },
+
+    render: function () {
+        this.populate(this.options.items);
+    },
+
+    _createBtns: function (items) {
+        var o = this.options;
+        return BI.createItems(items, {
+            type: "bi.text_button"
+        });
+    },
+
+    _packageBtns: function (btns) {
+        var o = this.options;
+
+        for (var i = o.layouts.length - 1; i > 0; i--) {
+            btns = BI.map(btns, function (k, it) {
+                return BI.extend({}, o.layouts[i], {
+                    items: [
+                        BI.extend({}, o.layouts[i].el, it)
+                    ]
+                })
+            })
+        }
+        return btns;
+    },
+
+    _packageItems: function (items, packBtns) {
+        return BI.createItems(BI.makeArrayByArray(items, {}), BI.clone(packBtns));
+    },
+
+    _packageLayout: function (items) {
+        var o = this.options, layout = BI.deepClone(o.layouts[0]);
+
+        var lay = BI.formatEL(layout).el;
+        while (lay && lay.items && !BI.isEmpty(lay.items)) {
+            lay = BI.formatEL(lay.items[0]).el;
+        }
+        lay.items = items;
+        return layout;
+    },
+
+    populate: function (items) {
+        var self = this;
+        items = items || [];
+        this.options.items = items;
+        items = this._packageItems(items, this._packageBtns(this._createBtns(items)));
+        if (!this.layouts) {
+            this.layouts = BI.createWidget(BI.extend({element: this}, this._packageLayout(items)));
+        } else {
+            this.layouts.populate(this._packageLayout(items).items);
+        }
+    }
+});
+BI.VirtualGroup.EVENT_CHANGE = "EVENT_CHANGE";
+
+$.shortcut("bi.virtual_group", BI.VirtualGroup);
\ No newline at end of file
diff --git a/src/base/combination/map.button.js b/src/base/combination/map.button.js
deleted file mode 100644
index 365f6bc15..000000000
--- a/src/base/combination/map.button.js
+++ /dev/null
@@ -1,115 +0,0 @@
-/**
- * value作为key值缓存button，  不支持顺序读写
- * 适合用于频繁增删的一组button
- * Created by GUY on 2015/8/10.
- * @class BI.ButtonMap
- * @extends BI.ButtonTree
- */
-
-BI.ButtonMap = BI.inherit(BI.ButtonTree, {
-    _defaultConfig: function () {
-        return BI.extend(BI.ButtonMap.superclass._defaultConfig.apply(this, arguments), {
-            baseCls: "bi-button-map"
-        })
-    },
-
-    _init: function () {
-        BI.ButtonMap.superclass._init.apply(this, arguments);
-    },
-
-    _createBtns: function (items) {
-        var self = this, o = this.options;
-        var buttons = BI.createWidgets(BI.createItems(items, {type: "bi.text_button", once: o.chooseType === 0}));
-        var keys = BI.map(items, function (i, item) {
-            item = BI.stripEL(item);
-            if (!(BI.isKey(item.id) || BI.isKey(item.value))) {
-                throw new Error("item必须包含id或value属性");
-            }
-            return item.id || item.value;
-        });
-        return BI.object(keys, buttons);
-    },
-
-    setValue: function (v) {
-        var self = this;
-        v = BI.isArray(v) ? v : [v];
-        BI.each(this.buttons, function (val, item) {
-            if (!BI.isFunction(item.setSelected)) {
-                item.setValue(v);
-                return;
-            }
-            if (v.contains(val)) {
-                item.setSelected && item.setSelected(true);
-            } else {
-                item.setSelected && item.setSelected(false);
-            }
-        });
-    },
-
-    setNotSelectedValue: function (v) {
-        var self = this;
-        v = BI.isArray(v) ? v : [v];
-        BI.each(this.buttons, function (val, item) {
-            if (!BI.isFunction(item.setSelected)) {
-                item.setNotSelectedValue(v);
-                return;
-            }
-            if (v.contains(val)) {
-                item.setSelected && item.setSelected(false);
-            } else {
-                item.setSelected && item.setSelected(true);
-            }
-        });
-    },
-
-    populate: function (items) {
-        var self = this;
-        var args = [].slice.call(arguments);
-        var linkHashMap = new BI.LinkHashMap();
-        var val = function (item) {
-            return item.id || item.value;
-        };
-        if (!this.buttons) {
-            this.buttons = {};
-        }
-        //所有已存在的和新添加的
-        var willCreated = [];
-        BI.each(items, function (i, item) {
-            item = BI.stripEL(item);
-            if (self.buttons[val(item)]) {
-                var ob = self.buttons[val(item)];
-                args[0] = item.items;
-                args[2] = item;
-                ob.populate && ob.populate.apply(ob, args);
-            } else {
-                willCreated.push(item);
-            }
-        });
-        //创建新元素
-        args[0] = willCreated;
-        var newBtns = this._btnsCreator.apply(this, args);
-
-        //整理
-        var array = [];
-        BI.each(items, function (i, item) {
-            item = BI.stripEL(item);
-            var button = self.buttons[val(item)] || newBtns[val(item)];
-            linkHashMap.add(val(item), button);
-            array.push(button);
-        });
-        this.buttons = linkHashMap.map;
-
-        BI.DOM.hang(this.buttons);
-        this.empty();
-
-        var packages = this._packageItems(items, this._packageBtns(array));
-        BI.createWidget(BI.extend({element: this}, this._packageLayout(packages)));
-    },
-
-    getIndexByValue: function (value) {
-        throw new Error("不能使用getIndexByValue方法");
-    }
-});
-BI.ButtonMap.EVENT_CHANGE = "EVENT_CHANGE";
-
-$.shortcut("bi.button_map", BI.ButtonMap);
\ No newline at end of file
diff --git a/src/core/widget.js b/src/core/widget.js
index 570cff7c3..b5d1f5666 100644
--- a/src/core/widget.js
+++ b/src/core/widget.js
@@ -43,6 +43,10 @@ BI.Widget = BI.inherit(BI.OB, {
 
     },
 
+    update: function () {
+
+    },
+
     destroyed: function () {
     },
 
@@ -367,10 +371,7 @@ BI.Widget = BI.inherit(BI.OB, {
     },
 
     destroy: function () {
-        this.empty();
-        this._isMounted = false;
-        this._parent = null;
-        this.destroyed();
+        this._unMount();
         this.element.destroy();
         this.fireEvent(BI.Events.DESTROY);
     }
diff --git a/src/core/wrapper/layout.js b/src/core/wrapper/layout.js
index 4bc18481d..b805c7501 100644
--- a/src/core/wrapper/layout.js
+++ b/src/core/wrapper/layout.js
@@ -63,35 +63,117 @@ BI.Layout = BI.inherit(BI.Widget, {
         }
     },
 
+    _getChildName: function (index) {
+        return index + "";
+    },
+
     _addElement: function (i, item) {
-        var o = this.options;
-        var w;
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        var self = this, w;
+        if (!this.hasWidget(this._getChildName(i))) {
             w = BI.createWidget(item);
-            this.addWidget(this.getName() + "-" + i, w);
+            this.addWidget(this._getChildName(i), w);
+            w.on(BI.Events.DESTROY, function () {
+                BI.each(self._children, function (name, child) {
+                    if (child === w) {
+                        self.removeItemAt(name | 0);
+                    }
+                });
+            });
         } else {
-            w = this.getWidgetByName(this.getName() + "-" + i);
+            w = this.getWidgetByName(this._getChildName(i));
         }
         return w;
     },
 
-    stroke: function (items) {
+    _getOptions: function (item) {
+        if (item instanceof BI.Widget) {
+            item = item.options;
+        }
+        item = BI.stripEL(item);
+        if (item instanceof BI.Widget) {
+            item = item.options;
+        }
+        return item;
+    },
+
+    _compare: function (item1, item2) {
         var self = this;
-        BI.each(items, function (i, item) {
-            if (!!item) {
-                self._addElement(i, item);
+        return eq(item1, item2);
+
+        //不比较函数
+        function eq(a, b, aStack, bStack) {
+            if (a === b) return a !== 0 || 1 / a === 1 / b;
+            if (a == null || b == null) return a === b;
+            var className = Object.prototype.toString.call(a);
+            switch (className) {
+                case '[object RegExp]':
+                case '[object String]':
+                    return '' + a === '' + b;
+                case '[object Number]':
+                    if (+a !== +a) return +b !== +b;
+                    return +a === 0 ? 1 / +a === 1 / b : +a === +b;
+                case '[object Date]':
+                case '[object Boolean]':
+                    return +a === +b;
             }
-        });
+
+            var areArrays = className === '[object Array]';
+            if (!areArrays) {
+                if (BI.isFunction(a) && BI.isFunction(b)) {
+                    return true;
+                }
+                a = self._getOptions(a);
+                b = self._getOptions(b);
+            }
+
+            aStack = aStack || [];
+            bStack = bStack || [];
+            var length = aStack.length;
+            while (length--) {
+                if (aStack[length] === a) return bStack[length] === b;
+            }
+
+            aStack.push(a);
+            bStack.push(b);
+
+            if (areArrays) {
+                length = a.length;
+                if (length !== b.length) return false;
+                while (length--) {
+                    if (!eq(a[length], b[length], aStack, bStack)) return false;
+                }
+            } else {
+                var keys = _.keys(a), key;
+                length = keys.length;
+                if (_.keys(b).length !== length) return false;
+                while (length--) {
+                    key = keys[length];
+                    if (!(_.has(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
+                }
+            }
+            aStack.pop();
+            bStack.pop();
+            return true;
+        }
     },
 
-    populate: function (items) {
-        var self = this;
-        this.options.items = items || [];
-        this.stroke(items);
+    _getWrapper: function () {
+        return this.element;
     },
 
-    resize: function () {
+    _addItem: function (index, item) {
+        for (var i = this.options.items.length; i > index; i--) {
+            this._children[this._getChildName(i)] = this._children[this._getChildName(i - 1)];
+        }
+        delete this._children[index];
+        this.options.items.splice(index, 0, item);
+    },
 
+    _removeItem: function (index) {
+        for (var i = index; i < this.options.items.length - 1; i++) {
+            this._children[this._getChildName(i)] = this._children[this._getChildName(i + 1)];
+        }
+        this.options.items.splice(index, 1);
     },
 
     /**
@@ -101,7 +183,7 @@ BI.Layout = BI.inherit(BI.Widget, {
     addItem: function (item) {
         var w = this._addElement(this.options.items.length, item);
         this.options.items.push(item);
-        w.element.appendTo(this.element);
+        w.element.appendTo(this._getWrapper());
         w._mount();
         return w;
     },
@@ -109,11 +191,54 @@ BI.Layout = BI.inherit(BI.Widget, {
     prependItem: function (item) {
         var w = this._addElement(this.options.items.length, item);
         this.options.items.unshift(item);
-        w.element.prependTo(this.element);
+        w.element.prependTo(this._getWrapper());
         w._mount();
         return w;
     },
 
+    addItemAt: function (index, item) {
+        if (index < 0 || index > this.options.items.length) {
+            return;
+        }
+        this._addItem(index, item);
+        var w = this._addElement(index, item);
+        if (index > 0) {
+            this._children[this._getChildName(index - 1)].element.after(w.element);
+        } else {
+            w.element.prependTo(this._getWrapper());
+        }
+        w._mount();
+        return w;
+    },
+
+    removeItemAt: function (index) {
+        if (index < 0 || index > this.options.items.length - 1) {
+            return;
+        }
+        this._children[this._getChildName(index)].destroy();
+        this._removeItem(index);
+    },
+
+    updateItemAt: function (index, item) {
+        if (index < 0 || index > this.options.items.length - 1) {
+            return;
+        }
+
+        var updated;
+        if (updated = this._children[this._getChildName(index)].update(this._getOptions(item))) {
+            return updated;
+        }
+        this._children[this._getChildName(index)].destroy();
+        var w = this._addElement(index, item);
+        this._children[this._getChildName(index)] = w;
+        if (index > 0) {
+            this._children[this._getChildName(index - 1)].element.after(w.element);
+        } else {
+            w.element.prependTo(this._getWrapper());
+        }
+        w._mount();
+    },
+
     addItems: function (items) {
         var self = this;
         BI.each(items, function (i, item) {
@@ -129,9 +254,9 @@ BI.Layout = BI.inherit(BI.Widget, {
     },
 
     getValue: function () {
-        var value = [];
-        BI.each(this._children, function (i, wi) {
-            var v = wi.getValue();
+        var self = this, value = [];
+        BI.each(this.options.items, function (i) {
+            var v = self._children[self._getChildName(i)].getValue();
             v = BI.isArray(v) ? v : [v];
             value = value.concat(v);
         });
@@ -139,15 +264,63 @@ BI.Layout = BI.inherit(BI.Widget, {
     },
 
     setValue: function (v) {
-        BI.each(this._children, function (i, wi) {
-            wi.setValue(v);
+        var self = this;
+        BI.each(this.options.items, function (i) {
+            self._children[self._getChildName(i)].setValue(v);
         })
     },
 
     setText: function (v) {
-        BI.each(this._children, function (i, wi) {
-            wi.setText(v);
+        var self = this;
+        BI.each(this.options.items, function (i) {
+            self._children[self._getChildName(i)].setText(v);
         })
+    },
+
+    update: function (item) {
+        var o = this.options;
+        var items = item.items;
+        var updated = false, i, len;
+        for (i = 0, len = o.items.length; i < len; i++) {
+            if (!this._compare(o.items[i], items[i])) {
+                updated = this.updateItemAt(i, items[i]) || updated;
+            }
+        }
+        if (o.items.length > items.length) {
+            for (i = items.length; i < o.items.length; i++) {
+                this.removeItemAt(i);
+            }
+        } else if (items.length > o.items.length) {
+            for (i = o.items.length; i < items.length; i++) {
+                this.addItemAt(i, items[i]);
+            }
+        }
+        this.options.items = items;
+        return updated;
+    },
+
+    stroke: function (items) {
+        var self = this;
+        BI.each(items, function (i, item) {
+            if (!!item) {
+                self._addElement(i, item);
+            }
+        });
+    },
+
+    populate: function (items) {
+        var self = this, o = this.options;
+        items = items || [];
+        if (this._isMounted) {
+            this.update({items: items});
+            return;
+        }
+        this.options.items = items;
+        this.stroke(items);
+    },
+
+    resize: function () {
+
     }
 });
 $.shortcut('bi.layout', BI.Layout);
\ No newline at end of file
diff --git a/src/core/wrapper/layout/adapt/adapt.center.js b/src/core/wrapper/layout/adapt/adapt.center.js
index 072d929bd..a6fe5c9dd 100644
--- a/src/core/wrapper/layout/adapt/adapt.center.js
+++ b/src/core/wrapper/layout/adapt/adapt.center.js
@@ -36,7 +36,7 @@ BI.CenterAdaptLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "top": "0", "left": "0", "margin": "0px auto"});
             td = BI.createWidget({
@@ -47,9 +47,9 @@ BI.CenterAdaptLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + "-" + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + "-" + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
         td.element.css({"max-width": o.columnSize[i]});
@@ -107,20 +107,8 @@ BI.CenterAdaptLayout = BI.inherit(BI.Layout, {
         // console.log("center_adapt布局不需要resize");
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$tr;
     },
 
     populate: function (items) {
diff --git a/src/core/wrapper/layout/adapt/adapt.horizontal.js b/src/core/wrapper/layout/adapt/adapt.horizontal.js
index dbcb42a15..004217555 100644
--- a/src/core/wrapper/layout/adapt/adapt.horizontal.js
+++ b/src/core/wrapper/layout/adapt/adapt.horizontal.js
@@ -36,7 +36,7 @@ BI.HorizontalAdaptLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "top": "0", "left": "0", "margin": "0px auto"});
             td = BI.createWidget({
@@ -47,9 +47,9 @@ BI.HorizontalAdaptLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + "-" + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + "-" + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
         td.element.css({"max-width": o.columnSize[i] + "px"});
@@ -106,20 +106,8 @@ BI.HorizontalAdaptLayout = BI.inherit(BI.Layout, {
         // console.log("horizontal_adapt布局不需要resize");
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
+    _getWrapper: function () {
+        return this.$tr;
     },
 
     populate: function (items) {
diff --git a/src/core/wrapper/layout/adapt/adapt.vertical.js b/src/core/wrapper/layout/adapt/adapt.vertical.js
index e4cf6de7a..473083050 100644
--- a/src/core/wrapper/layout/adapt/adapt.vertical.js
+++ b/src/core/wrapper/layout/adapt/adapt.vertical.js
@@ -33,7 +33,7 @@ BI.VerticalAdaptLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + "-" + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "top": "0", "left": "0", "margin": "0px auto"});
             td = BI.createWidget({
@@ -44,9 +44,9 @@ BI.VerticalAdaptLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + "-" + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + "-" + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
 
@@ -100,20 +100,8 @@ BI.VerticalAdaptLayout = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$tr);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$tr;
     },
 
     resize: function () {
diff --git a/src/core/wrapper/layout/flex/wrapper/flex.wrapper.center.js b/src/core/wrapper/layout/flex/wrapper/flex.wrapper.center.js
index 1f23508c9..fb3f95fcd 100644
--- a/src/core/wrapper/layout/flex/wrapper/flex.wrapper.center.js
+++ b/src/core/wrapper/layout/flex/wrapper/flex.wrapper.center.js
@@ -40,20 +40,8 @@ BI.FlexCenterLayout = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$wrapper;
     },
 
     resize: function () {
diff --git a/src/core/wrapper/layout/flex/wrapper/flex.wrapper.horizontal.js b/src/core/wrapper/layout/flex/wrapper/flex.wrapper.horizontal.js
index 1aff0d676..4214b2c80 100644
--- a/src/core/wrapper/layout/flex/wrapper/flex.wrapper.horizontal.js
+++ b/src/core/wrapper/layout/flex/wrapper/flex.wrapper.horizontal.js
@@ -70,20 +70,8 @@ BI.FlexHorizontalLayout = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$wrapper;
     },
 
     resize: function () {
diff --git a/src/core/wrapper/layout/flex/wrapper/flex.wrapper.vertical.center.js b/src/core/wrapper/layout/flex/wrapper/flex.wrapper.vertical.center.js
index 32da933fd..96cd78078 100644
--- a/src/core/wrapper/layout/flex/wrapper/flex.wrapper.vertical.center.js
+++ b/src/core/wrapper/layout/flex/wrapper/flex.wrapper.vertical.center.js
@@ -68,20 +68,8 @@ BI.FlexVerticalCenter = BI.inherit(BI.Layout, {
         }
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.push(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
-    },
-
-    prependItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        this.options.items.unshift(item);
-        w.element.appendTo(this.$wrapper);
-        w._mount();
-        return w;
+    _getWrapper: function(){
+        return this.$wrapper;
     },
 
     resize: function () {
diff --git a/src/core/wrapper/layout/layout.horizontal.js b/src/core/wrapper/layout/layout.horizontal.js
index eabd14174..94d30683d 100644
--- a/src/core/wrapper/layout/layout.horizontal.js
+++ b/src/core/wrapper/layout/layout.horizontal.js
@@ -36,7 +36,7 @@ BI.HorizontalLayout = BI.inherit(BI.Layout, {
         var o = this.options;
         var td;
         var width = o.columnSize[i] <= 1 ? (o.columnSize[i] * 100 + "%") : o.columnSize[i];
-        if (!this.hasWidget(this.getName() + i)) {
+        if (!this.hasWidget(this._getChildName(i))) {
             var w = BI.createWidget(item);
             w.element.css({"position": "relative", "margin": "0px auto"});
             td = BI.createWidget({
@@ -47,9 +47,9 @@ BI.HorizontalLayout = BI.inherit(BI.Layout, {
                 },
                 items: [w]
             });
-            this.addWidget(this.getName() + i, td);
+            this.addWidget(this._getChildName(i), td);
         } else {
-            td = this.getWidgetByName(this.getName() + i);
+            td = this.getWidgetByName(this._getChildName(i));
             td.element.attr("width", width);
         }
 
@@ -107,12 +107,8 @@ BI.HorizontalLayout = BI.inherit(BI.Layout, {
         // console.log("horizontal layout do not need to resize");
     },
 
-    addItem: function (item) {
-        var w = this._addElement(this.options.items.length, item);
-        w._mount();
-        this.options.items.push(item);
-        w.element.appendTo(this.$tr);
-        return w;
+    _getWrapper: function(){
+        return this.$tr;
     },
 
     populate: function (items) {
diff --git a/src/core/wrapper/layout/layout.lattice.js b/src/core/wrapper/layout/layout.lattice.js
index 4f21ae806..6bbe195df 100644
--- a/src/core/wrapper/layout/layout.lattice.js
+++ b/src/core/wrapper/layout/layout.lattice.js
@@ -37,6 +37,12 @@ BI.LatticeLayout = BI.inherit(BI.Layout, {
         return w;
     },
 
+    addItemAt: function (item) {
+        var w = BI.LatticeLayout.superclass.addItemAt.apply(this, arguments);
+        this.resize();
+        return w;
+    },
+
     resize: function () {
         this.stroke(this.options.items);
     },