Loaded SWF communicating with Main Timeline

Question

Let's say I load an external SWF to my main timeline. In that
loaded SWF, I'd like to have a button that when clicked, removes a
Movie Clip from the main timeline.
How do I do that? Should be simple, right?

Answer 1

Sorry I misunderstood your question, but here is the code.
The second part is original swf altering a movie clip in the
external (mov2.swf), just making an mc 50% transparent....
circle_btn.addEventListener(MouseEvent.CLICK, printButton);
function printButton(myevent:MouseEvent){
var portLoader:Loader=new Loader();
var printThumbRequest:URLRequest=new URLRequest("mov2.swf");
portLoader.load(printThumbRequest);
stage.addChild(portLoader);
portLoader.contentLoaderInfo.addEventListener(Event.COMPLETE,
loaded);
function loaded(event:Event) {
circle2_btn.addEventListener(MouseEvent.CLICK,
talkToExternal);
function talkToExternal(myevent:MouseEvent){
event.target.content.green_mc.alpha=.5;
}