更改widget reset方法

src/base/combination/combo.js

@@ -515,7 +515,7 @@
         populate: function (items) {
             this._assertPopupView();
             this.popupView.populate.apply(this.popupView, arguments);
-            this.combo.populate.apply(this.combo, arguments);
+            this.combo.populate && this.combo.populate.apply(this.combo, arguments);
         },
 
         _setEnable: function (arg) {

src/base/single/trigger/trigger.js

@@ -24,7 +24,4 @@ BI.Trigger = BI.inherit(BI.Single, {
     getKey: function () {
 
     },
-    populate: function () {
-
-    }
 });

src/core/widget.js

@@ -565,7 +565,7 @@
         },
 
         // 默认的populate方法就是干掉重来
-        populate: function () {
+        reset: function () {
             this.purgeListeners();
             this.empty();
             this._initCurrent();