Код элементарный.

Код AS3:
public class Test extends Sprite{
private var loader:Loader;
private var urlRequest:URLRequest;
public function Test() {
loader = new Loader();
urlRequest = new URLRequest("LoaderTest1.swf");
loader.load(urlRequest);
this.addChild(loader);
loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, this.progressHandler);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, this.completeHandler);
}
public function progressHandler(e:ProgressEvent):void {
Debugger.trace(LoaderInfo(e.target).bytesLoaded);//срабатывает
}
public function completeHandler(e:Event):void {
Debugger.trace("GGG");//не срабатывает
}
}