ActionScript 3.0 :: Access A Mc Or Textfeild From A Non Document Class?

Sep 21, 2010

It used to be simple to access an object you put on the stage like a mc or dynamic text field by simply using _root.instanceName ect.  Now I see references to making references to the Stage and such like:
 
private var stage:Stage;
stage = stageRef; 
and I am still confused.
 
What I have going on is, I have placed a movieclip on the stage in Flash and gave it an instance name of Cell_mc.I have a cusom class that extends MovieClip with the following imports

import flash.display.MovieClip;
import flash.events.Event;
import flash.events.EventDispatcher;

[code]....
 
This Class is tied to a set of MovieClips in my Library.

I have a listener: this.addEventListener(MouseEvent.MOUSE_DOWN,pickUp);
 
And a function:

private function pickUp(event:MouseEvent):void
{
this.startDrag();

[code]....
 
I get the following error whenever I try to access an object I placed on the stage from anywhere other than the document class:
 
1120: Access of undefined property Cell_mc.
 
How do I access the cell_mc that is already on the stage from this non-document class?

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