rb_define_method (cWindow, "hide", c_hide, 0);
rb_define_method (cWindow, "visible?", c_visible_get, 0);
rb_define_method (cWindow, "delete", c_delete, 0);
rb_define_method (cWindow, "hide", c_hide, 0);
rb_define_method (cWindow, "visible?", c_visible_get, 0);
rb_define_method (cWindow, "delete", c_delete, 0);