+ void setup_invert_buttons ();
+ void set_invert_button_state ();
+ void invert_toggled (uint32_t, BindableToggleButton *);
+ void invert_menu_toggled (uint32_t);
+ bool invert_press (GdkEventButton *);
+
+ int _i_am_the_modifier;
+ std::list<BindableToggleButton*> _invert_buttons;
+ Gtk::Menu* _invert_menu;
+
+ static uint32_t _max_invert_buttons;