ActionScript 3.0 :: StartDrag - Displaying Another MovieClip As Tooltip

I'm trying to add a tooltip of sorts to a mc. the mc has the buttonMode set to true and when I rollover it I want it to display another movie clip as a tooltip. I've worked out how to do this with startDrag. The problem is that unless i remove the event listener for rollover the mouse flickers and won't work properly. I fixed this by removing the event listener in the same function, which works great. The problem is that I have to add and event listener for rollout, but the flickering starts again when its added.

Here's the code I have so far:
clapperHit_mc.addEventListener(MouseEvent.ROLL_OVER, videoCursor);
clapperHit_mc.buttonMode = true;
function videoCursor(event:MouseEvent):void {
videoCursor_mc.startDrag(true);
videoCursor_mc.visible = true;
videoCursor_mc.gotoAndPlay(1);