as3加载外部xml，并在其子节点上添加子节点

package 
{
	import flash.display.MovieClip;
	import flash.net.URLRequest;
	import flash.net.URLLoader;
	import flash.events.Event;
	public class XmlTest extends MovieClip
	{
		public function Xmltest()
		{
			// constructor code
			var myXml:XML=new XML();
			var XML_URL:String = "0220试验.xml";
			var myXMLURL:URLRequest = new URLRequest(XML_URL);
			var myLoader:URLLoader = new URLLoader(myXMLURL);
			myLoader.addEventListener("complete",xmlLoaded);
			
		}
		public function xmlLoaded(event:Event):void
		{
			trace("Data loaded.");
			var loader:URLLoader=event.target as URLLoader;
			var xmlDoc=new XML(loader.data);
			if(xmlDoc.toString().indexOf("shortKey")!=-1)
			{
				trace("存在");
				wItem=(<node type="rightMenu" cid="rightMenu01_ZX" cname="右键菜单" x="0" y="0" width="1024" height="728" selected="false" menu="null"/>);
				xmlDoc.child(0).appendChild(<node type="rightMenu" cid="rightMenu01_ZX" cname="右键菜单" x="0" y="0" width="1024" height="728" selected="false" menu="null"/>);
				trace(xmlDoc.child(0).toString());
			}
			
		}
	}
}