ActionScript 3.0 :: Removing EventListener From Imported Class

I have an on enter frame listener defined in a function:
Code:
function sideClicked(e:MouseEvent):void {
removeEventListener(Event.ENTER_FRAME, loop);
var targetName=e.target.name;
var a:Array=[];[Code] .....

The looptoposition() function simple calls a function from a custom class repetitively to move an object until it reaches its position. This is the function it calls from the included custom class:
Code:
public function rotateToPos(a:Number,b:Number,c:Number):void {
if(!cubeReady){return;}
if(cube.rotationY<b){
cube.rotationY+=3;
[Code] .....

This gets the desired result visually - the cube rotates until the chosen point and then stops - however the listener continues. I have two problems:
1) I would like to remove the listener but can't seem to do so from the imported class - I'm having trouble referencing my functions in the root flash file.
2) I also need to declare that the function has completed - but the equalities mean that b is either greater or less than but never equal to? Whats a better way of getting the cube to rotate to a set position on each frame? The reason for the equalities are the cube can turn two different directions. So rotation could be negative.