bugfix 绑定事件的地方延迟绑定一下，会有好处

src/base/combination/combo.js

@@ -43,7 +43,8 @@
         render: function () {
             var self = this, o = this.options;
             this._initCombo();
-            this._initPullDownAction();
+            // 延迟绑定事件，这样可以将自己绑定的事情优先执行
+            BI.nextTick(this._initPullDownAction.bind(this));
             this.combo.on(BI.Controller.EVENT_CHANGE, function (type, value, obj) {
                 if (self.isEnabled() && self.isValid()) {
                     if (type === BI.Events.EXPAND) {

src/base/combination/expander.js

@@ -25,7 +25,8 @@ BI.Expander = BI.inherit(BI.Widget, {
         var self = this, o = this.options;
         this._expanded = !!o.el.open;
         this._initExpander();
-        this._initPullDownAction();
+        // 延迟绑定事件，这样可以将自己绑定的事情优先执行
+        BI.nextTick(this._initPullDownAction.bind(this));
         this.expander.on(BI.Controller.EVENT_CHANGE, function (type, value, obj) {
             if (self.isEnabled() && self.isValid()) {
                 if (type === BI.Events.EXPAND) {

src/base/combination/switcher.js

@@ -25,7 +25,8 @@ BI.Switcher = BI.inherit(BI.Widget, {
     render: function () {
         var self = this, o = this.options;
         this._initSwitcher();
-        this._initPullDownAction();
+        // 延迟绑定事件，这样可以将自己绑定的事情优先执行
+        BI.nextTick(this._initPullDownAction.bind(this));
         this.switcher.on(BI.Controller.EVENT_CHANGE, function (type, value, obj) {
             if (self.isEnabled() && self.isValid()) {
                 if (type === BI.Events.EXPAND) {

src/base/single/button/button.basic.js

@@ -31,7 +31,7 @@ BI.BasicButton = BI.inherit(BI.Single, {
     _init: function () {
         BI.BasicButton.superclass._init.apply(this, arguments);
         var opts = this.options;
-        
+
         if (opts.shadow) {
             this._createShadow();
         }
@@ -44,7 +44,8 @@ BI.BasicButton = BI.inherit(BI.Single, {
         if (this.options.selected === true) {
             this.setSelected(true);
         }
-        this.bindEvent();
+        // 延迟绑定事件，这样可以将自己绑定的事情优先执行
+        BI.nextTick(this.bindEvent.bind(this));
         BI.BasicButton.superclass._initRef.apply(this, arguments);
     },