Currently the root-menu (well, that's relevant to me currently). Behaves inconsistently and annoyingly if you invoke a keybinding then menu just blinks briefly and stays on. While mouse clicks follow good UI practice and toggle the menu on and off on repeated clicks.
I implemented the toggling if anyone is interested I can share my idea, it works perfectly fine, but again probably could be done cleaner by someone who's more experienced.
Let me know. :)