+ _dpi_slider.set_draw_value(false);
+ _dpi_slider.add_mark(50, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(60, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(70, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(80, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(90, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(100, Gtk::POS_TOP, dflt);
+ _dpi_slider.add_mark(125, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(150, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(175, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(200, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(225, Gtk::POS_TOP, empty);
+ _dpi_slider.add_mark(250, Gtk::POS_TOP, empty);
+