filename_widget->signal_activate().connect(sigc::mem_fun(*this,&Widget_ValueBase::activate));
time_widget->signal_activate().connect(sigc::mem_fun(*this,&Widget_ValueBase::activate));
distance_widget->signal_activate().connect(sigc::mem_fun(*this,&Widget_ValueBase::activate));
filename_widget->signal_activate().connect(sigc::mem_fun(*this,&Widget_ValueBase::activate));
time_widget->signal_activate().connect(sigc::mem_fun(*this,&Widget_ValueBase::activate));
distance_widget->signal_activate().connect(sigc::mem_fun(*this,&Widget_ValueBase::activate));