+ add(*(ind_halt=new GLtk::Indicator(res)));
+ ind_halt->set_geometry(GLtk::Geometry(10, 69, 40, 12));
+
+ add(*(btn=new GLtk::Button(res, "Halt")));
+ btn->set_geometry(GLtk::Geometry(10, 44, 40, 25));
+ btn->signal_clicked.connect(sigc::mem_fun(this, &MainPanel::toggle_halt));
+