bypass_button.signal_button_release_event().connect (sigc::mem_fun(*this, &PlugUIBase::bypass_button_release), false);
focus_button.add_events (Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
bypass_button.signal_button_release_event().connect (sigc::mem_fun(*this, &PlugUIBase::bypass_button_release), false);
focus_button.add_events (Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);