I installed gnome-shell right away, and then i noticed that Nautilus main menubar (File, Edit and such menus) is missing. It does not appear inside the File Manager window nor on the "global menubar". (also happens on Unity).
Noticed, that monodevelop dont work with unity's global menu and gnumdk's kded-appmenu. After googling a bit found solution here: http://habrahabr.ru/post/143861/ported from deb to aur:http://habrahabr.ru/post/143861/Thanks to Nikita kekekeks Tsukanov!