访问List的itemRenderer的组件中定义的方法

主程序文件List1.mxml:

 1 <?xml version="1.0" encoding="utf-8" ?>
 2 <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
 3   <mx:Style>
 4     Application
 5     {
 6     font-size:12px;
 7     }
 8   </mx:Style>
 9   <mx:Script>
10     import mx.controls.Alert;
11     import mx.controls.listClasses.ListBaseContentHolder;
12     
13 
14     private function handleClick():void
15     {
16       if(txt.text=="")
17       Alert.show("请输入数字1-7(注意:未验证合法性)");
18       else
19       {
20         var n:int=parseInt(txt.text);
21         //这句是关键代码
22         (mylist.getChildAt(2) as ListBaseContentHolder).listItems[n-1][0].alertBtn();
23       }
24     }
25   </mx:Script>
26   <mx:Model id="arr">
27     <root>
28       <item label="按钮1" />
29       <item label="按钮2" />
30       <item label="按钮3" />
31       <item label="按钮4" />
32       <item label="按钮5" />
33       <item label="按钮6" />
34       <item label="按钮7" />
35       <item label="按钮8" />
36       <item label="按钮9" />
37     </root>
38   </mx:Model>
39   <mx:List id="mylist" dataProvider="{arr.item}" width="100"    rowCount="9" leading="0" itemRenderer="MyRenderer" />
40   <mx:TextInput id="txt" />
41   <mx:Button label="触发" click="handleClick();" />
42 </mx:Application>

itemRenderer的组件文件MyRenderer.mxml:

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <mx:Box xmlns:mx="http://www.adobe.com/2006/mxml" width="100%" height="100%" horizontalGap="0"    
 3   verticalGap="0" paddingLeft="0" paddingRight="0"    paddingTop="0" paddingBottom="0">
 4   <mx:Script>
 5     import mx.controls.Alert;
 6     
 7     public function alertBtn():void
 8     {
 9     Alert.show("触发了alertBtn(),我是:"+btn.label);
10     }
11   </mx:Script>
12   <mx:Button id="btn" label="{data.label}" width="100%" cornerRadius="0" />
13 </mx:Box>