add

bi/base.js

@@ -1260,8 +1260,14 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
         return node;
     },
 
+    empty: function () {
+        BI.ButtonGroup.superclass.empty.apply(this, arguments);
+        this.options.items = [];
+    },
+
     destroy: function () {
         BI.ButtonGroup.superclass.destroy.apply(this, arguments);
+        this.options.items = [];
     }
 });
 BI.extend(BI.ButtonGroup, {

bi/core.js

@@ -12871,7 +12871,7 @@ BI.Layout = BI.inherit(BI.Widget, {
         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];
+        delete this._children[this._getChildName(index)];
         this.options.items.splice(index, 0, item);
     },
 
@@ -12879,6 +12879,7 @@ BI.Layout = BI.inherit(BI.Widget, {
         for (var i = index; i < this.options.items.length - 1; i++) {
             this._children[this._getChildName(i)] = this._children[this._getChildName(i + 1)];
         }
+        delete this._children[this._getChildName(this.options.items.length - 1)];
         this.options.items.splice(index, 1);
     },
 
@@ -13038,6 +13039,11 @@ BI.Layout = BI.inherit(BI.Widget, {
         });
     },
 
+    empty: function () {
+        BI.Layout.superclass.empty.apply(this, arguments);
+        this.options.items = [];
+    },
+
     populate: function (items) {
         var self = this, o = this.options;
         items = items || [];

dist/base.js

@@ -1260,8 +1260,14 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
         return node;
     },
 
+    empty: function () {
+        BI.ButtonGroup.superclass.empty.apply(this, arguments);
+        this.options.items = [];
+    },
+
     destroy: function () {
         BI.ButtonGroup.superclass.destroy.apply(this, arguments);
+        this.options.items = [];
     }
 });
 BI.extend(BI.ButtonGroup, {

dist/core.js

@@ -19469,7 +19469,7 @@ BI.Layout = BI.inherit(BI.Widget, {
         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];
+        delete this._children[this._getChildName(index)];
         this.options.items.splice(index, 0, item);
     },
 
@@ -19477,6 +19477,7 @@ BI.Layout = BI.inherit(BI.Widget, {
         for (var i = index; i < this.options.items.length - 1; i++) {
             this._children[this._getChildName(i)] = this._children[this._getChildName(i + 1)];
         }
+        delete this._children[this._getChildName(this.options.items.length - 1)];
         this.options.items.splice(index, 1);
     },
 
@@ -19636,6 +19637,11 @@ BI.Layout = BI.inherit(BI.Widget, {
         });
     },
 
+    empty: function () {
+        BI.Layout.superclass.empty.apply(this, arguments);
+        this.options.items = [];
+    },
+
     populate: function (items) {
         var self = this, o = this.options;
         items = items || [];

src/base/combination/group.button.js

@@ -297,8 +297,14 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
         return node;
     },
 
+    empty: function () {
+        BI.ButtonGroup.superclass.empty.apply(this, arguments);
+        this.options.items = [];
+    },
+
     destroy: function () {
         BI.ButtonGroup.superclass.destroy.apply(this, arguments);
+        this.options.items = [];
     }
 });
 BI.extend(BI.ButtonGroup, {

src/core/wrapper/layout.js

@@ -181,7 +181,7 @@ BI.Layout = BI.inherit(BI.Widget, {
         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];
+        delete this._children[this._getChildName(index)];
         this.options.items.splice(index, 0, item);
     },
 
@@ -189,6 +189,7 @@ BI.Layout = BI.inherit(BI.Widget, {
         for (var i = index; i < this.options.items.length - 1; i++) {
             this._children[this._getChildName(i)] = this._children[this._getChildName(i + 1)];
         }
+        delete this._children[this._getChildName(this.options.items.length - 1)];
         this.options.items.splice(index, 1);
     },
 
@@ -348,6 +349,11 @@ BI.Layout = BI.inherit(BI.Widget, {
         });
     },
 
+    empty: function () {
+        BI.Layout.superclass.empty.apply(this, arguments);
+        this.options.items = [];
+    },
+
     populate: function (items) {
         var self = this, o = this.options;
         items = items || [];