Window without parent always on the top of the application main window

Hi,
I would use window without parent to have them listed when the cursor is on the icon on the taskbar of Windows (I don't know the behavior of other systems).
I tried the flag Qt::WindowStaysOnTopHint but the window is on top of system windows too.
Is it possible to solve this issue using Qt ? How ?
Thanks

I think QDialog based subwindows might stay on top of their parent.

Cheers,
_