[flexcoders] help with scrollTipFunction on List

[Mark]

on this board I found someone that created the scrollTipFunction like 
this:

public function myLabelFunc(dir:String, pos:Number):String {
   this.selectedIndex = pos + 7;
   return this.selectedItem.data;
}

It works but at the same time it's selecting that index.  Is there 
another way to show the scroll tip without selecting an item?

Thanks