G4UA::G4AtlasSteppingAction Node1 G4UA::G4AtlasSteppingAction + G4AtlasSteppingAction() + UserSteppingAction() + addAction() + getActions() Node2 G4UserSteppingAction Node2->Node1 Node3 std::vector< G4UserStepping Action * > + elements Node3->Node1 -m_actions