void OnToggled(object sender, Gtk.ToggledArgs args)
        {
            TreeIter iter;

            store.GetIterFromString(out iter, args.Path);
            DeployFile file = (DeployFile)store.GetValue(iter, ColObject);
            bool       inc  = !builder.IsFileIncluded(file);

            builder.SetFileIncluded(file, inc);
            store.SetValue(iter, ColIncluded, inc);
        }