ActionScript 3.0 :: Tweenlite - Scale Up In Both Width And Height?

I have a strange and extremely annoying problem.I have a simple would-be navigation bar that works perfectly with this code:

Code:
import gs.TweenLite;
var buttons:Array = new Array();
var btnProps:Array = new Array();[code].....

It takes the 5 items in the menu and when they are individually moused-over, they simple move 10 points to the left, then when the mouse is off they move back to their original position.Now I want to change it so that they scale up a tiny bit in both width and height. I've been trying to do this for some time and I have no idea why this code does not work:

Code:
var _rect:Rectangle = new Rectangle(_btn.x, _btn.y, _btn.width, _btn.height);
btnProps.push(_rect);
}[code]...

Everything in these two versions is EXACTLY the same except for this part I've posted.