Graphics Flash ActionScript

package{
    import flash.display.Sprite;
    import flash.display.Shape;
    import flash.display.StageScaleMode;
    import flash.display.StageAlign;
    public class Main extends Sprite
    {
        private var Maib:Shape;
        public function ShapeTest()
        {
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            var shape:Shape = new Shape();
            addChild(shape);
            shape.x = 100;
            shape.y = 100;
            shape.graphics.beginFill(0x000000, 1);
            shape.graphics.drawCircle(0, 0, 100);
            shape.graphics.endFill();
        }
    }
}