loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadComplete);
private function loadComplete(event:Event){
trace("done");
addChild(loader);
}

xmlLoader.dataFormat=URLLoaderDataFormat.TEXT;
xmlLoader.addEventListener(Event.COMPLETE,xmlLoaded);
private function xmlLoaded(event:Event
{
try {myXML = XML(event.target.data);area.text=myXML;}
catch (e:TypeError) {area.text="Load faild:n"+e.message;}
}