diff --git a/src/core/ob.js b/src/core/ob.js
index 8f1d4a885..182c68f07 100644
--- a/src/core/ob.js
+++ b/src/core/ob.js
@@ -4,7 +4,11 @@
  * @abstract
  */
 BI.OB = function (config) {
-    this.options = $.extend(this._defaultConfig(config), config);
+    var props = this.props;
+    if (BI.isFunction(this.props)) {
+        props = this.props(config);
+    }
+    this.options = $.extend(this._defaultConfig(config), props, config);
     this._init();
     this._initRef();
 };
@@ -14,10 +18,7 @@ $.extend(BI.OB.prototype, {
     },
 
     _defaultConfig: function (config) {
-        if (BI.isFunction(this.props)) {
-            return this.props(config);
-        }
-        return this.props;
+        return {};
     },
 
     _init: function () {
diff --git a/src/core/widget.js b/src/core/widget.js
index 799934f2e..1326dee57 100644
--- a/src/core/widget.js
+++ b/src/core/widget.js
@@ -7,7 +7,7 @@
  */
 BI.Widget = BI.inherit(BI.OB, {
     _defaultConfig: function () {
-        return BI.extend({
+        return BI.extend(BI.Widget.superclass._defaultConfig.apply(this), {
             tagName: "div",
             attributes: null,
             data: null,
@@ -17,8 +17,9 @@ BI.Widget = BI.inherit(BI.OB, {
             invisible: false,
             invalid: false,
             baseCls: "",
+            extraCls: "",
             cls: ""
-        }, BI.Widget.superclass._defaultConfig.call(this))
+        })
     },
 
     //生命周期函数
@@ -74,11 +75,8 @@ BI.Widget = BI.inherit(BI.OB, {
         } else {
             this.element = $(document.createElement(o.tagName));
         }
-        if (o.baseCls) {
-            this.element.addClass(o.baseCls);
-        }
-        if (o.cls) {
-            this.element.addClass(o.cls);
+        if (o.baseCls || o.extraCls || o.cls) {
+            this.element.addClass((o.baseCls || "") + " " + (o.extraCls || "") + " " + (o.cls || ""));
         }
         if (o.attributes) {
             this.element.attr(o.attributes);