gboolean cb_zoomin(GtkAction * action);
gboolean cb_zoomout(GtkAction * action);
gboolean cb_fullscreen(GtkAction * action);
+gboolean cb_fullscreen_click(GtkAction * action);
gboolean menu_cb_show_scale(GtkAction * action);
gboolean menu_cb_show_routes(GtkAction * action);
gboolean menu_cb_show_tracks(GtkAction * action);