Graphical Class Hierarchy Node0 InDet::ITRT_TrackExtension Tool::IEventData Node1 Trk::EventDataBase < EventData, InDet:: ITRT_TrackExtensionTool ::IEventData > Node0->Node1 Node2 InDet::TRT_TrackExtension Tool_xk::EventData Node1->Node2 Node3 InDet::TRT_TrackExtension ToolCosmics::EventData Node1->Node3