I am looking for a way to make my Chat GUI in front of all the applications not only in windows. AlwaysOnTop does not solve this problem. As I mentioned mainly during playing games on full screen. I couldn't find anything on the internet so here I am :P
EDIT: I found out that if you change display settings in the game to "Borderless" or "Windowed full screen" your GUI window will stay on top with "AlwaysOnTop". Thanks for help anyways.