Flex: How to avoid flickering cursor for custom cursor on mouse down

Question

I set a custom cursor using the CursorManager on a sprite's mouse down event.

The custom cursor is shown. However, when I keep the mouse pressed the system cursor shows as well and is flickering.

Any idea how to prevent this?

I tried - higher cursor priorities - preventing the default in the mouse down event

nothing seems to work.

Changing the cursor just on mouse over works fine.

Thanks Stefan

PS: - Safari on Mac - Flash debug player 10.0.2.54