how to make my window stays on top when I'm playing fullscreen game?

[Todong Ma <gbstack08 gmail com>]

Hi,everyone!

I want to write a program which can stays on top after it ran when I'm
playing fullscreen game.
(I mean when I'm playing the fullscreen game,I can still see that popup
window)

I have tried gtk_window_fullscreen(),gtk_window_activate() and
gtk_window_set_keep_above(),but they didn't work

what should I do to make my window stays on the top?

Any suggestion is appreciated!


Regards,
Todong Ma