Error with simple rollover colour transition please help

trying to do a simple rollover colour transition in Actionscript 3, and I'm getting

ReferenceError: Error #1069: Property transform not found on

fl.transitions.Tween and there is no default value. at dell_fla::MainTimeline/tweenToFinal() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at fl.transitions::Tween/setPosition() at fl.transitions::Tween/update() at fl.transitions::Tween/set time() at fl.transitions::Tween/nextFrame() at fl.transitions::Tween/onEnterFrame()

Heres my script

import fl.transitions.Tween;
    import fl.transitions.TweenEvent;
    import fl.transitions.easing.Strong;
    import fl.motion.Color;
    import flash.events.Event;
    import flash.geom.ColorTransform;
    import flash.display.DisplayObject;

    var startColor:uint=0xCCFF00;
    var finalColor:uint=0x003399;
    var colorInfo:ColorTransform;
    // Colour transition for country mouseover
    function initColorTransform(mc:MovieClip):void
    {
        colorInfo = mc.transform.colorTransform;
        var myTween:Tween=new Tween(mc,'alpha',Strong.easeOut,0,1,1,true);
        myTween.addEventListener(TweenEvent.MOTION_CHANGE,tweenToFinal);
    }
    function tweenToFinal(e:TweenEvent):void
    {
        colorInfo.color=Color.interpolateColor(startColor,finalColor,e.position);
        e.target.transform.colorTransform=colorInfo;
    }

    function countryMouseOver(e:Event):void{
        trace('countryMouseOver '+e.target);
        var countryMc = e.target;
        var localPos:Point = new Point(countryMc.x,countryMc.y);
        var globalPos:Point = countryMc.localToGlobal(localPos);
        trace('local pos: 开发者_Go百科'+localPos+ ' global pos:'+globalPos);
        initColorTransform(countryMc);
    }

Have a look at the TweenEvent docs. The e.target is not your movie clip but the tween itself. Obtain your movieclip using Tween(e.target).obj.

   function tweenToFinal(e:TweenEvent):void
    {
        colorInfo.color=Color.interpolateColor(startColor,finalColor,e.position);
        MovieClip(Tween(e.target).obj).transform.colorTransform=colorInfo;
    }