A dynamic 100% width and scaleX

programming flash
1

The idea is that I have a box the first is scaled to the width of the stage meaning (box.scaleX = 100) == (box.width = stage.stageWidth)

So after I declare that the box’s 100% width is equal to the stage width
I then want to scale that box by a persent meaning
(box.scaleX = 50) == 50% or half of the stage’s width

On top of theres alot of code I did not include I know this code is wrong and that is what could use some help one.

Main class


import Box
var testBox = new Box();
testBox.scaleX = 50;

Box class


class Box extends Sprite{
        var _scaleX:Number;  
         var  child:Sprite; // this is the box localy in the class

        public function get scaleX():Number{
              return _scaleX;
        }
        public function set scaleX(scale:Number):void{
              _scaleX = 100 / stage2.stageWidth;
              child.scaleX = scale / scaleX;
        }
        public function Box(){
             /**
             * Make a box at the same width as the stage
             * code not included
             */ 
       }
}