G4UA::MCTruthSteppingActionTool Node1 G4UA::MCTruthSteppingActionTool - m_volumeCollectionMap + MCTruthSteppingActionTool() + initialize() # makeAndFillAction() Node2 G4UA::UserActionToolBase < MCTruthSteppingAction > # m_actions + UserActionToolBase() + fillUserAction() # makeAndFillAction() Node2->Node1 Node3 extends< AthAlgTool, IUserActionTool > Node3->Node2