These values are used by the function gtk-ui-manager-add-ui to determine what UI element to create.

(define-g-flags "GtkUIManagerItemType" gtk-ui-manager-item-type
  (:export t
   :type-initializer "gtk_ui_manager_item_type_get_type"))
  (:auto 0)
  (:menubar 1)
  (:menu 2)
  (:toolbar 4)
  (:placeholder 8)
  (:popup 16)
  (:menuitem 32)
  (:toolitem 64)
  (:separator 128)
  (:accelerator 256)
  (:popup-with-accels 512))  

:auto

Pick the type of the UI element according to context.

:menubar

Create a menubar.

:menu

Create a menu.

:toolbar

Create a toolbar.

:placeholder

Insert a placeholder.

:popup

Create a popup menu.

:menuitem

Create a menuitem.

:toolitem

Create a toolitem.

:separator

Create a separator.

:accelerator

Install an accelerator.

:popup-with-accels

Same as :popup, but the accelerators of the actions are shown.

The gtk-ui-manager-item-type flags has been deprecated since version 3.10 and should not be used in newly written code.