timeslider->set_flags(Gtk::CAN_FOCUS);
//time_scroll->signal_value_changed().connect(sigc::mem_fun(*work_area, &studio::WorkArea::render_preview_hook));
timeslider->set_flags(Gtk::CAN_FOCUS);
//time_scroll->signal_value_changed().connect(sigc::mem_fun(*work_area, &studio::WorkArea::render_preview_hook));