ActionScript 3.0 :: How To Call Function Of Parent Object From Loaded SWF

I have a swf that should be able to load another swf in runtime. Then I would like the loaded swf to call a method of the parent, loader swf, like this:

Code:
parent.closeForm;
But when I compile it, it throws this error:
1119: Access of possibly undefined property closeForm through a reference with static type flash.displayisplayObjectContainer.

I've tried:
Code:
if (parent != stage){
parent.closeForm;
}

So flash won't run this code at compile time, but it always throws that error. Here is the code of the LOADER swf:

Code:
private function loadForm():void {
var loader:Loader = new Loader()
var mRequest:URLRequest = new URLRequest(formPath);
loader.load(mRequest);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onFormCompleteHandler);
[Code] .....

How could I write an expression that should call a function of the LOADER swf without having this compile-time error?