How to activate menu bar from my app?

[oficjalne100]

I have no problem with show/hide menu. I have problem with menu activation (after showing).

[Archimedes]

Ohh...I got it now. I think this is the default behavior (on linux not sure about Windows). I created a project with a class inheriting QMainWindow and by pressing ALT I can access the menu bar.

[oficjalne100]

So far so good! One more hint: I want programicaly simulate the ALT key. I caled this behaviour as "activate menu".