New to AS3

1

*I have created a movie clip that gets loaded into a flash document via the following code:


var Xpos:Number=420;
var Ypos:Number=10;
var swf:MovieClip;
var loader:Loader=new Loader();
var defaultSWF:URLRequest=new URLRequest("swfs/blank.swf");
loader.load(defaultSWF);
loader.x=Xpos;
loader.y=Ypos;
addChild(loader);
//Btns Universal Function
function btnClick(event:MouseEvent):void{
 removeChild(loader);
 var newSWFRequest:URLRequest=new URLRequest("swfs/"+event.target.name+".swf");
 loader.load(newSWFRequest);
 loader.x=Xpos;
 loader.y=Ypos;
 addChild(loader);
}
//BTN Listners
TBCD_01.addEventListener(MouseEvent.CLICK,btnClick);
TBCD_02.addEventListener(MouseEvent.CLICK,btnClick);
MRB_01.addEventListener(MouseEvent.CLICK,btnClick);
MRB_02.addEventListener(MouseEvent.CLICK,btnClick);

I am trying to add a button to the movie clip that is loaded that will unload or close the movie clip. The button instance name is btn_close. Sure would like some guidance here nothing I have tried works.*