update

src/core/widget.js

@@ -251,12 +251,14 @@
         },
 
         __afterMount: function (lifeHook, predicate) {
+            if (this._isMounted) {
                 BI.each(this._children, function (i, widget) {
                     widget.__afterMount && widget.__afterMount(lifeHook, predicate);
                 });
                 lifeHook !== false && callLifeHook(this, "mounted");
                 this.fireEvent(BI.Events.MOUNT);
                 predicate && predicate(this);
+            }
         },
 
         _mountChildren: null,