How to avoid arrow flashing

Hi,

I’m trying to avoid arrow flashing in a
3d world. Normaly it’s possible to avoid it by selecting a little part of image to update but in a 3d world all the image is updated for each frame.

How could i do?

I would suggest forgetting about hardware window cursor (set it to empty image) and render your own cursor below it, in actual scene - be it 3d or 2d. This way you will get exactly what you want, on every system.