RemoveChild in parent.swf from child.swf (AS3)

Question

Hi! How do I remove a child from a parent timeline with an externally-loaded swf? Specifically, I have a main.swf that loads movie_1.swf and movie_2.swf. In the movie_1.swf, I have a button to remove movie_2.swf from main.swf.
//--------- main.swf code:
var loader1:Loader = new Loader();
var loader2:Loader = new Loader();
loader1.load(new URLRequest("movie_1.swf"));
loader2.load(new URLRequest("movie_2.swf"));
addChild(loader1);
addChild(loader2);
//------------- movie_1.swf code:
removeMovie2_btn.addEventListener(MouseEvent.CLICK , removeMovie2);
function removeMovie2(event:MouseEvent):void
this.parent.parent.removeChild(this.loader2); // this does not work (get error code 2007, "Parameter child must be non-null")
// Thank you!

Answer 1

Here's how your code will change:
//--------- main.swf code:
var loader1:Loader = new Loader();
var loader2:Loader = new Loader();
loader1.contentLoaderInfo.addEventListener(Event.COMPLETE, assignMovie1Listener);
loader1.load(new URLRequest("movie_1.swf"));
loader2.load(new URLRequest("movie_2.swf"));
addChild(loader1);
addChild(loader2);
function assignMovie1Listener(evt:Event):void {
      MovieClip(evt.currentTarget.content).addEventListener("eventTriggered", removeLoader2);
function removeLoader2(evt:Event):void {
      loader2.unloadAndStop();
      removeChild(loader2);
//------------- movie_1.swf code:
removeMovie2_btn.addEventListener(MouseEvent.CLICK , removeMovie2);
function removeMovie2(event:MouseEvent):void
      dispatchEvent(new Event("eventTriggered"));