获取控件的绝对位置

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
import mx.controls.Alert;

private function click(event:Event):void
{
//var l:Label=loc.x;
  var l:Label=loc;
var myp:Point=stage.localToGlobal(new Point(loc.x,loc.y));
var myp1:Point=loc.localToGlobal(new Point(loc.x,loc.y));
Alert.show(myp1.x.toString()+myp1.y.toString());
}
]]>
</mx:Script>
<mx:HBox>
<mx:Panel title="left" width="200">
<mx:Button id="btn" label="get location" click="click(event)"/>
</mx:Panel>
<mx:Panel title="right" width="400">
<mx:Label id="loc" text="my loaction"/>
</mx:Panel>
</mx:HBox>
</mx:Application>