加载swf并获取swf中的元件

import flash.display.Loader;
import flash.net.URLRequest;
import flash.events.Event;
import flash.system.ApplicationDomain;
import flash.display.MovieClip;


var loader:Loader = new Loader();
var req:URLRequest = new URLRequest('test.swf');
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onComplete);
loader.load(req);

function onComplete(e:Event):void
{
var swf:* = e.target;
var domain:ApplicationDomain = swf.applicationDomain as ApplicationDomain;
var TF:Class = domain.getDefinition('TF') as Class;
var tt:MovieClip = (new TF()) as MovieClip;
addChild(tt);

tt.tf.text = 'hahah';

//var cls:Class = ?loader.contentLoaderInfo.applicationDomain.getDefinition('TF') as Class

}

//?