How to MASK an external .SWF movie?

programming flash
1

Hi,

I am using external .SWF movie on stage by using the following code. I want to mask some of the portion of this movie. How can I mask an external movie?

Code:

var  mySwf1:SWFLoader = new SWFLoader("Clock.swf", {width:200, height:200,  x:-300, y:-300, container:this, onComplete:completeHandler1});

mySwf1.load();

function completeHandler1(event:LoaderEvent):void {
    TweenMax.fromTo(event.target.content, 3, {x:270, y:250, scaleX:.5,  scaleY:.5, alpha:0}, {x:270, y:250, scaleX:2, scaleY:2, alpha:1,  delay:3});


   TweenLite.delayedCall(30, mySwf1.unload)

I have entered the [COLOR=#ff0000]**code **[/COLOR]on on [COLOR=#ff0000]**Layer2 **[/COLOR]and created a [COLOR=#ff0000]**MASK **[/COLOR](Circle shape) on [COLOR=#ff0000]**Layer1 **[/COLOR]and selected the MASK option by right clicking on [COLOR=#ff0000]Layer1[/COLOR]. But It did not work. How to resolve the problem?

Please help.