flex按钮任意拖动

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundColor="#D99191">
<mx:Array id="coffeeArray">
</mx:Array>
<mx:Script>
	<![CDATA[
//		按钮控件任意拖动
		private function startMove(event:Event):void{
                Sprite(event.target).startDrag();  
            }     
            private function stopMove(event:Event):void{
                Sprite(event.target).stopDrag();  
            }  
	 	internal?function?InitLs():void
	 	{
	 		var?srcArr:Array?=?new?Array();
	 		srcArr.push("China?Soft");
	 		srcArr.unshift("BOCO");
	 		srcArr.unshift("PCCW");
	 		SrcLs.dataProvider?=?srcArr;
			var?desArr:Array?=?new?Array("PM",?"PL",?"SE");
			DesLs.dataProvider=desArr;
			
			
	 	}
	 	
//	 	控件拖拽效果
	 	internal function MovLs():void
	 	{
	 		SrcLs.dragEnabled?=?true;
	 		SrcLs.dropEnabled?=?true;
			SrcLs.allowMultipleSelection?=?true;
			DesLs.dragEnabled?=?true;//
			DesLs.dropEnabled?=?true;
			var?testDebStr:String?=?new?String("Drag?Success");
	 	}
	]]>
</mx:Script>
	<mx:List x="111" y="92" height="282" id="SrcLs" width="200"></mx:List>
	<mx:List x="568" y="92" height="282" id="DesLs" width="200"></mx:List>
	<mx:Button x="334" y="123" label="初始化" width="167" click="InitLs()"/>
	<mx:Button x="334" y="193" label="拖拽效果" width="167" click="MovLs()"/>
	<mx:Button x="334" y="282" label="可以拖动" width="167" id="MLable" mouseDown="startMove(event)" mouseUp="stopMove(event)"/>
</mx:Application>