Sets the related action on the activatable object.
> GtkActivatable implementors need to handle the related-action > property and call gtk_activatable_do_set_related_action() when it changes.
the gtk.Action to set
2.16
Sets the related action on the activatable object.
> GtkActivatable implementors need to handle the related-action > property and call gtk_activatable_do_set_related_action() when it changes.