diff --git a/src/base/combination/expander.js b/src/base/combination/expander.js
index cb86583800..58c3ed70bf 100644
--- a/src/base/combination/expander.js
+++ b/src/base/combination/expander.js
@@ -103,7 +103,7 @@ BI.Expander = BI.inherit(BI.Widget, {
                         }
                     });
                     break;
-                default :
+                case "click":
                     if (e) {
                         self.element.off(e + "." + self.getName()).on(e + "." + self.getName(), BI.debounce(function (e) {
                             if (self.expander.element.__isMouseInBounds__(e)) {
diff --git a/src/widget/selecttree/selecttree.expander.js b/src/widget/selecttree/selecttree.expander.js
index 6ce69d1fcb..142f3c8ef6 100644
--- a/src/widget/selecttree/selecttree.expander.js
+++ b/src/widget/selecttree/selecttree.expander.js
@@ -7,7 +7,7 @@ BI.SelectTreeExpander = BI.inherit(BI.Widget, {
     _defaultConfig: function () {
         return BI.extend(BI.SelectTreeExpander.superclass._defaultConfig.apply(this, arguments), {
             baseCls: "bi-select-tree-expander",
-            trigger: "click",
+            trigger: "",
             toggle: true,
             direction: "bottom",
             isDefaultInit: true,
@@ -20,7 +20,7 @@ BI.SelectTreeExpander = BI.inherit(BI.Widget, {
         BI.SelectTreeExpander.superclass._init.apply(this, arguments);
         var self = this, o = this.options;
 
-        this.trigger = BI.createWidget(BI.extend({stopPropagation: true}, o.el));
+        this.trigger = BI.createWidget(o.el);
         this.trigger.on(BI.Controller.EVENT_CHANGE, function (type) {
             if (type === BI.Events.CLICK) {
                 if (this.isSelected()) {