Addressing class variables which are movies

Hello, I’m having a bit of a problem with this.

I have a class- MiniMap which extends the MovieClip class.

This class has a variable which is itself a movieClip, this movieClip is a small window which can be moved around on the map to select which portion of the miniMap will be shown in the bigger map.

How do I refer back a events on the class variables to effect the host class?

Here’s some code:

dynamic class MiniMap extends MovieClip {
	
	var myWindow:WorldWindow;  
	var myZoomIn:MovieClip;
	var myZoomOut:MovieClip;
	
	function MiniMap() {
		
		this.attachMovie("WorldWindow", "myW", this.getNextHighestDepth());
	
		myWindow  = myW;
			}

That’s the opening of the MiniMap

Now for the world window class:

dynamic class WorldWindow extends MovieClip {

	function WorldWindow() {
		
		this._x = 10;
		this._y = 10;
		this._width = 80;
		this._height = 50;
		
		}
		
	public function onPress(){
		this.startDrag(false,0,0,200 - this._width, 126 - this._height);
		trace("doing something");
//THIS DOES NOTHING...
			}
		
	function onRelease(){
		this.stopDrag();
			}
	
}

Any hints would be very gratefully received.

Thanks
M