How do I reference a MovieClip from a class

Question

Hi. Trying to learn AS3 and having a hard time ; (
I'm working on a game. I have a Ship class that uses addChild
to add a linked Bullet MovieClip to the stage. The Bullet MC is
linked to the class below. I've got it working so it moves up the
screen, but now I need to build a hitTest, however I cant get
access to a movie clip I've placed on the stage, "enemyDisplay_mc".
How do I reference this MC? In AS2 I would just do a _root.
Thanks!
package {
import flash.display.*;
import flash.events.Event;
public class Weapons extends MovieClip {
private var _thisWeaponMC:MovieClip;
private var _enemyHit:DisplayObject;
private var _speed:Number;
public function Weapons () {
this.addEventListener (Event.ADDED,Initialize);
private function Initialize (event:Event):void {
//trace ("Weapons");
_thisWeaponMC =
MovieClip(this.parent.getChildByName(this.name));
trace ("_thisWeaponMC: " + _thisWeaponMC);
_thisParent = event.currentTarget.parent;
trace ("_thisParent: " + _thisParent);
_enemyHit = this.parent.getChildByName("enemyDisplay_mc");
trace ("_enemyHit: " + _enemyHit);
_speed=20;
this.addEventListener (Event.ENTER_FRAME,moveShip);
private function moveShip (event:Event):void {
this.y-= _speed;
}

Answer 1

This code is called from my Ship class.
The Ship class is the Base class of the ship movie clip.
VulcanShot is the linkage class name of the bullet movie,
it's base class is Weapons.
Thanks!