How to create GtkMenus

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1. create a 
GtkMenuBar()
;
2. create a 
GtkMenuItem()
and append to 
GtkMenuBar()
;
3. create a 
GtkMenu()
e and add itens inside  with 
GtkMenuItem::new_with_label($label)
;
4. you can use 
GtkSeparatorMenuItem()
too;
5. append 
GtkMenu
as submenu of 
GtkMenuItem()
;
6. the structure are 
GtkMenu()
as submenu of 
GtkMenuItem()
, and 
GtkMenuItem()
inside a 
GtkMenuBar()
;
7. connect the 
GtkMenuItem
to signal 
activate
to detect when click on the menu;