- nitrox_value = GTK_SPIN_BUTTON(widget);
- gtk_spin_button_set_range(nitrox_value, 21.0, 100.0);
+ cylinder.o2 = widget;
+ cylinder.gasmix_button = gtk_check_button_new();
+ gtk_box_pack_start(GTK_BOX(gtk_widget_get_parent(cylinder.o2)),
+ cylinder.gasmix_button, FALSE, FALSE, 3);
+ g_signal_connect(cylinder.gasmix_button, "toggled", G_CALLBACK(nitrox_cb), cylinder.o2);
+
+ gtk_spin_button_set_range(GTK_SPIN_BUTTON(cylinder.o2), 21.0, 100.0);