有哪位大神知道，调用外部swf后，返回当前界面按钮不能再点击，大神给我指导下，谢谢，谢谢，谢谢

click trace

代码如下
stop();
stage.displayState = StageDisplayState.FULL_SCREEN;
import flash.display.Loader;
import flash.net.URLRequest;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.display.SimpleButton
tc.addEventListener(MouseEvent.CLICK,tcClick);
function tcClick(e:MouseEvent)
{
fscommand("quit");
}
var loader:Loader;
function loadswf(url:String):void
{
var req:URLRequest = new URLRequest(url);
var loader:Loader=new Loader();
loader.load(req);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onLoader);
}
function onLoader(evt:Event):void
{
loader = evt.target.loader;
addChild(loader);
}
aa.addEventListener(MouseEvent.CLICK,aaClick);
function aaClick(evt:MouseEvent):void
{
loadswf("yygs.swf");
}
bb.addEventListener(MouseEvent.CLICK,bbClick);
function bbClick(evt:MouseEvent):void
{
loadswf("yyhj.swf");
}
cc.addEventListener(MouseEvent.CLICK,ccClick);
function ccClick(evt:MouseEvent):void
{
loadswf("ksjs.swf");
}
dd.addEventListener(MouseEvent.CLICK, fl_ClickToGoToWebPage);
function fl_ClickToGoToWebPage(event:MouseEvent):void
{
//下面是打开网页
navigateToURL(new URLRequest("http://www.yyxrmyy.org"), "_blank");
//下面是打开下级目录的网页
//navigateToURL(new URLRequest("nextPage/a.html"), "_blank");
}