Click, animate rotation of Object by +90° via AS3?

I have a button that will rotate an object in its parent by 90 degrees every time its clicked:

b_rotate_CW.addEventListener(MouseEvent.CLICK, rotateCW);

function rotateCW(event:MouseEvent):void

{

Object(this).parent.module.rotation += 90;

}

Which is fine, but I think it would be a nice touch if the object's rotation were animated.

I tried this:

import fl.transitions.Tween;

import fl.transitions.easing.*;

import fl.transitions.TweenEvent;

b_rotate_CW.addEventListener(MouseEvent.CLICK, rotateCW);

function rotateCW(event:MouseEvent):void

{

var rCW:Tween = new Tween(Object(this).parent.module, "rotate", Strong.easeOut, 0, +90, .5, true);

}

... but it does nothing at all, I am guessing that "rotate" is a property option, I can find no documentation for that, only x, y, their scale and alpha.

I'm sure this has been done by many, can anyone offer a helpful clue as to how this function would be properly coded?

Thanks!