ACCEL2(Gtk::AccelKey('>',Gdk::CONTROL_MASK,"<Actions>//seek-next-second"));
ACCEL2(Gtk::AccelKey('<',Gdk::CONTROL_MASK,"<Actions>//seek-prev-second"));
ACCEL2(Gtk::AccelKey('o',Gdk::CONTROL_MASK,"<Actions>//toggle-onion-skin"));
ACCEL2(Gtk::AccelKey('>',Gdk::CONTROL_MASK,"<Actions>//seek-next-second"));
ACCEL2(Gtk::AccelKey('<',Gdk::CONTROL_MASK,"<Actions>//seek-prev-second"));
ACCEL2(Gtk::AccelKey('o',Gdk::CONTROL_MASK,"<Actions>//toggle-onion-skin"));