boost::shared_ptr<PBD::Controllable> position_control;
boost::shared_ptr<PBD::Controllable> width_control;
PBD::ScopedConnectionList panvalue_connections;
PBD::ScopedConnectionList panshell_connections;
boost::shared_ptr<PBD::Controllable> position_control;
boost::shared_ptr<PBD::Controllable> width_control;
PBD::ScopedConnectionList panvalue_connections;
PBD::ScopedConnectionList panshell_connections;