override public function update():void
        {
        accumulator += FlxG.elapsed;
        if (accumulator >= TimeStep)
        {

            if(moveRight == true)
            tileGroup.velocity.x = 2000;
            else if (moveRight == false)
            tileGroup.velocity.x = -2000;

            if (tileGroup.x + (numberOfTiles * 40) > 40)
            moveRight = false;

            if ( tileGroup.x  < 1)
            moveRight = true;
            FlxU.collide(tileGroup, tileGroup);
            if (FlxG.keys.justPressed("ESCAPE"))
            accumulator = accumulator - TimeStep;
        }
        super.update();
        }