GtkStatusIcon and a pop-up menu

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http://developer.gnome.org/gtk/2.24/GtkStatusIcon.html

http://developer.gnome.org/gtk/2.24/GtkMenu.html#gtk-menu-popup

Dynamic menus can be created by hiding menuitems.

So, a popupmenu widget is created and filled with menuitems and [sub]menus -- 
how's it going to be shown? I think it'll require a dedicated action and 
probably another to close it. The code to create menuitems and submenus already 
exists so it might not be too involved.

Original issue reported on code.google.com by thunor...@hotmail.com on 20 Sep 2012 at 12:06