MuonGMR4::ToroidDetectorManager Node1 MuonGMR4::ToroidDetector Manager   + ToroidDetectorManager() + ~ToroidDetectorManager() + getNumTreeTops() + getTreeTop() + addTreeTop() Node2 GeoVDetectorManager     Node2->Node1 Node3 std::vector< PVConstLink > + elements   Node3->Node1 -m_treeTops