tgl->set_value(train.get_locomotive().get_function(i->first));
tgl->signal_toggled.connect(sigc::bind(sigc::mem_fun(this, &TrainPanel::func_toggled), i->first));
tgl->set_value(train.get_locomotive().get_function(i->first));
tgl->signal_toggled.connect(sigc::bind(sigc::mem_fun(this, &TrainPanel::func_toggled), i->first));