loader疑惑

今天寫本身的loader管理類時，發現一個問題，若是證實flash是併發加載資源的呢？

var loader:Loader=new Loader;
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onChildComp3, false, 0, true);
loader.contentLoaderInfo.addEventListener(Event.OPEN, onChildOpen3, false, 0, true);
loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onChildPro3, false, 0, true);
loader.contentLoaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, onChildHttp3, false, 0, true);

var loader2:Loader=new Loader;
loader2.contentLoaderInfo.addEventListener(Event.COMPLETE, onChildComp3, false, 0, true);
loader2.contentLoaderInfo.addEventListener(Event.OPEN, onChildOpen3, false, 0, true);
loader2.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onChildPro3, false, 0, true);
loader2.contentLoaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, onChildHttp3, false, 0, true);

var loader3:Loader=new Loader;
loader3.contentLoaderInfo.addEventListener(Event.COMPLETE, onChildComp3, false, 0, true);
loader3.contentLoaderInfo.addEventListener(Event.OPEN, onChildOpen3, false, 0, true);
loader3.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onChildPro3, false, 0, true);
loader3.contentLoaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, onChildHttp3, false, 0, true);

loader.load(new URLRequest("assets/comp.swf"));
loader2.load(new URLRequest("assets/nav.swf"));
loader3.load(new URLRequest("assets/vector.swf"));

如上一段代碼，運行時，老是會先輸出loader的全部信息，在loader完成後再加載loader2，在loader2完成後再加載loader3~彷佛並無併發加載~

我理解的併發加載是各自loader的progress信息會交錯輸出。不知道這樣理解對不對~

如今還沒解決這個問題~鬱悶~