Help Graphics.prototype?

programming flash
1

Hi all,

Sorry for the newbie question.
I need to add a global method to the Sprite Class, for example “pos” but just cant get it to work.

Anyone know what i am doing wrong?

This works with MovieClips, but i need this to work with Stripte objects to:

DisplayObject.prototype.pos = function(x:int, y:int, w:int, h:int):void {
  this.x = x;
  this.y = y;
  this.width = w;
  this.height = h;
};

var header:Sprite = addChild(new MovieClip()) as MovieClip;
drawBox(header,0,0, stage.stageWidth, 90, 0x333333, 1, 2, 0x000000, 1);
..
header.pos(20, 20, 50, 100);

But this does not work:

import flash.display.Graphics;
Graphics.prototype.pos = function(x:int, y:int, w:int, h:int):void {
  this.x = x;
  this.y = y;
  this.width = w;
  this.height = h;
};

var header:Sprite = addChild(new Sprite()) as Sprite;
drawBox(header,0,0, stage.stageWidth, 90, 0x333333, 1, 2, 0x000000, 1);
..
header.graphics.pos(20, 20, 50, 100);