FLex 超链接另一个Web系统

[Bindable]public var mapXML:XML;[Bindable]public var pathsysUrl:String; //路径查询系统 地址//初始化方法protected function init(event:FlexEvent):void{//加载地图配置文件var mapUrl:String="mapUrl.xml";var mapUl:URLLoader=new URLLoader();mapUl.load(new URLRequest(mapUrl));mapUl.addEventListener(Event.COMPLETE, mapLoadFun);}private function mapLoadFun(event:Event):void{mapXML=XML(event.target.data);pathsysUrl=mapXML.child("pathsysUrl").@url; //路径查询系统}protected function linkbutton1_clickHandler(event:MouseEvent):void{//ExternalInterface.call("window.open('http://www.csdn.net/')")ExternalInterface.call(this.pathsysUrl)}<?xml version="1.0"?><mapurl><pathsysUrlurl="window.open('http://www.csdn.net/')" /></mapurl>