table->attach (*Gtk::manage (new Gtk::Label (_("Threshold"), 1, 0.5)), 0, 1, n, n + 1, Gtk::FILL);
table->attach (_threshold, 1, 2, n, n + 1, Gtk::FILL);
table->attach (*Gtk::manage (new Gtk::Label (_("Threshold"), 1, 0.5)), 0, 1, n, n + 1, Gtk::FILL);
table->attach (_threshold, 1, 2, n, n + 1, Gtk::FILL);