Oop hell

Hi all,

I am trying to make a class that makes a tiled background but i cant make it to work.

Here is the code:

import flash.display.BitmapData;
class StageMaker {
    var pattern = "pattern";
    function StageMaker() {
        this.fillBG(pattern);
    }
    function fillBG(tile) {
        this.beginBitmapFill(tile);
        this.lineTo(Stage.width, 0);
        this.lineTo(Stage.width, Stage.height);
        this.lineTo(0, Stage.height);
        this.lineTo(0, 0);
        this.endFill();
    }
}