All items are inside a parent movieClip that is masked against a gradient object (both the mask and the gradient masks are cached as bitmaps!) The items have their own mouse listeners. The mouse event on each item is reported through the mouse cursor symbol on every item. You may scroll the list of items using your mouse wheel. The problem is: When you move your mouse on an item, the normal gradient mask corrupts and diminishes down to the full opaque region of the mask leaving the other parts of the masked object ruined!