Signal
GtkMenuToolButton::show-menu
Description [src]
The ::show-menu signal is emitted before the menu is shown.
It can be used to populate the menu on demand, using gtk_menu_tool_button_set_menu().
Note that even if you populate the menu dynamically in this way,
you must set an empty menu on the GtkMenuToolButton
beforehand,
since the arrow is made insensitive if the menu is not set.
Default handler: The default handler is called before the handlers added via |