flex Menubar 单节点事件怎么加

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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
backgroundColor="#FFFFFF" themeColor="#6699FF" layout="vertical">
<mx:Script>
public function add():void
{

}
</mx:Script>
<mx:MenuBar id="myMenuBar" labelField="@label" click="">
<mx:XMLList>
<menuitem label="添加" url=".../1.swf"/>
<menuitem label="导入" url=".../2.swf"/>
<menuitem label="查询" url=".../3.swf"/>
</mx:XMLList>
</mx:MenuBar>
</mx:Application>

单击一项，怎么获取url？

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[Defonds]

flex ...mark