[papervision] Scaling from other Cube point?

Hi,

I am testing with scaling a cube, like so

private function growCube():void {
		TweenLite.to(cube3, 2, {scaleX:1.5 , scaleY:1.5, scaleZ:1.5}  );
	}

But it scales from the center point (0,0,0) , i like to scale from front right bottom. For a 300,300,300 that would be
(150,150,150 ?)

How can i accomplish this?