onEnterFrame driven function not working in AS3

programming flash
1

There is a function that I use all the time written in AS2 with buttons and rollovers to create a smooth animation in and out that doesn’t relly on gotoAndPlay or gotoAndStop methods (as I have found them to be quite buggy. The AS2 code follows. I have started to write the same function in AS3, but keep getting errors when attempting to create a nested even listener for the onEnterFrame function that will drive the animation forward. How can I rewrite the AS2 function to work the same way in AS3.

This is the AS2 Code



btnBox.onRollOver = function() 
{
    btnBox.onEnterFrame = function() {
        if(btnBox._currentframe < 11) {
            btnBox.nextFrame();
        } else {
            delete btnBox.onEnterFrame;
        }
    }    
}


btnBox.onRollOut = function() 
{
    btnBox.onEnterFrame = function() {
        if (btnBox._currentframe > 1) {
            btnBox.prevFrame();
        } else {
            delete btnBox.onEnterFrame;
        }
    }
}

This is what I have started with, in AS3 but can’t figure out how to finish without errors.

import flash.events.Event;


btnBox.addEventListener(MouseEvent.ROLL_OVER, BiggerBox);
btnBox.addEventListener(MouseEvent.ROLL_OUT, SmallerBox);


function BiggerBox(Event:MouseEvent):void{
    trace("I hate AS3");
    if (btnBox.currentFrame < btnBox.totalFrames){
        btnBox.nextFrame();
    }
}


function SmallerBox(Event:MouseEvent):void{
    trace("I love AS3");
    if (btnBox.currentFrame > 1){
        btnBox.prevFrame();
    }
}