hitTestObject between different classes

programming flash
1

Hey there!
I have a noobie problem that seemed easy at first but have haunted me for a couple of days:
I’ making a simple drag n’ drop application in that I want to use different classes for both objects involved, the ones that will be dragged and the ones that will receive these first.
The situation is that I already have the instances on the stage, each one with instance names that follows a this: “one” for a draggable Movie clip and “oneTarget” for the coresponding Movie clip; “two” for a draggable Movie clip and “twoTarget” for the coresponding Movie clip and so on.

In the draggable object’s class, I’ve created a variable called _targetName:String to retain the name of the corresponding object to which the current draggable object must hit by adding the current objects’ name to the String “Target”, so this would result in a String with the same name of the matching piece on the stage.

Problem is that when I pass this variable to the hitTestObject parameter, I got erros in the runtime, mostly saying that the parameter must be non-null

these are my two classes’ code:

draggable objects

package
{
	import flash.display.MovieClip
	import flash.events.MouseEvent;
	import Targets
	import flash.display.DisplayObject;
	
	public class DragDrop extends MovieClip
	{
		private var _origX:Number;
		private var _origY:Number;
		private var _nomeComposto:MovieClip;
		private var _targetName:String;
		
		public function DragDrop()
		{
			_origX = this.x;
			_origY = this.y;
			_targetName = this.name + "Target";
			trace(_targetName);
			trace("DragDrop class working");
			this.addEventListener(MouseEvent.MOUSE_DOWN, dragMovie);
			this.addEventListener(MouseEvent.MOUSE_UP, releaseMovie);
		}
		
		internal function dragMovie(event:MouseEvent):void
		{
			this.startDrag();
			//trace(event.this.name + "Target");
		}
		
		internal function releaseMovie(event:MouseEvent):void
		{
			this.stopDrag();
			
			if(event.currentTarget.hitTestObject(MovieClip(root)._targetName))
			   {
				trace("working");
			   }	   
		}
	}
}

matching objects

package 
{
	import flash.display.MovieClip;
	import flash.events.MouseEvent;

	public class Targets extends MovieClip
	{

		public static var _nomeAlvo:String;
		//public static var _alvo:Target;

		public function Targets()
		{
			_nomeAlvo = this.name;
			//_alvo = this.name
			//this.addEventListener(MouseEvent.CLICK, verificaNome);
		}

		public function getName():String
		{
			return _nomeAlvo;
		}
		
		function verificaNome(event:MouseEvent):void
		{
			trace(event.currentTarget.getName());
		}

	}

}

Well, I’m not a native english speaker, so sorry for any mistake and a I hope I could have made myself as clear as possible.

Thanks in advance!