[flexcoders] Zoom instance

[{reduxdj}]

I started an AS3.0 zoomEffect, how do I add Exponential easing?  I need 
a little more clear example please.

(Here is my code, how do i do the easing method)

    private function zoomOut(e:MouseEvent):void{
                        var ret = new Zoom();
                        ret.duration = 1000;
                        ret.zoomWidthFrom=2;
                        ret.zoomWidthTo=1;
                        ret.zoomHeightFrom=2;
                        ret.zoomHeightTo=1;
                        ret.target=this;
                        ret.start();
            }

Thanks,
Patrick