as3.0中页面中嵌套加载页面

      今天想要实现页面中有个类似IFrame的层加载其他的flash。找到一个例子，可以通过，特地贴上来

Code
default.mxml中
<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" 

creationComplete="InitApp();"> 


<mx:Script> 
<![CDATA[ 

var _Tab1: tab1 = new tab1(); 

private function InitApp(): void 
{ 

} 

private function OnBtn1Click(aEvent: MouseEvent): void 
{ 
                              //创建类对象来加载. 
ml.url = ''; 
ml.addChild(_Tab1); 
} 

private function OnBtn2Click(aEvent: MouseEvent): void 
{ 
if (ml.contains(_Tab1)) 
{ 
ml.removeChild(_Tab1); 
} 
                                //使用Module 
/*  */ml.url = 'tab2.swf'; 
} 

private function OnBtn3Click(aEvent: MouseEvent): void 
{ 
ml.url = 'tab2.swf'; 
} 
]]> 
</mx:Script> 
<mx:Button x="21" y="28" label="Tab1" width="114" height="46" id="btn1" click="OnBtn1Click(event);"/> 
<mx:Button x="143" y="28" label="tab2" width="114" height="46" id="btn2" click="OnBtn2Click(event);"/> 
<mx:ModuleLoader x="0" y="91" width="100%" height="413" id="ml"> 
</mx:ModuleLoader> 

</mx:Application> 

 1 Module类型 类名tab1
 2
 3 <? xml version = " 1.0 "  encoding = " utf-8 " ?>  
 4 < mx:Module xmlns:mx = " http://www.adobe.com/2006/mxml "  width = " 624 "  height = " 484 "  backgroundColor = " #9DBEB4 " >  
 5 < mx:Label x = " 222 "  y = " 204 "  text = " I'm tab1 "  width = " 180 "  height = " 76 "  fontSize = " 30 " />  
 6 </ mx:Module >  
 7
 8
 9
10

1 tab2中
2
3
4 <? xml version = " 1.0 "  encoding = " utf-8 " ?>  
5 < mx:Module xmlns:mx = " http://www.adobe.com/2006/mxml "  layout = " absolute "  width = " 602 "  height = " 452 "  backgroundColor = " #734646 " >  
6 < mx:Label x = " 222 "  y = " 204 "  text = " I'm tab2 "  width = " 180 "  height = " 76 "  fontSize = " 30 " />  
7 </ mx:Module >