ViewCreatorExtraPrefetchROITool Node1 ViewCreatorExtraPrefetch ROITool - m_extraRoiWHK - m_extraRoiLinkName - m_mergeWithOriginal - m_roiCreator - m_roiUpdater + ViewCreatorExtraPrefetch ROITool() + initialize() + attachROILinks() Node2 extends< AthAlgTool, IViewCreatorROITool > Node2->Node1