Existing Menu/Toolbar API

• Code for creating menus looks a bit like this:
• Create GtkMenuBar
• Add GtkMenuItems for toplevel menus, and attach GtkMenus to them.
• Add GtkMenuItems to the GtkMenus
• Attach callbacks to the "activate" signal of the menu items
• Repeat for sub-menus ...
• Toolbars are similar, although no sub-menus.
• The GtkItemFactory code can help here, but it is essentially a short hand for the above.

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