[adaminaudio]

you have this bit in your window.mxml code:

<mx:Image source="{selectedImage}"/>



but you probably need to set that property when you pop the window open:

private function launchPopUp(e:MouseEvent):void {
				if(images.selectedImage){
					var win : Window = new Window();
win.selectedImage = images.selectedImage;  //set it here...
					PopUpManager.addPopUp(win,this,true);
					PopUpManager.centerPopUp(win);
			}