RemoveVertexDuringGroupCollapseOrExpand ( IVertex oVertex, Boolean bUndrawVertex ) { Debug.Assert(oVertex != null); AssertValid(); if (bUndrawVertex && m_oLastGraphDrawingContext != null) { m_oGraphDrawer.UndrawVertex(oVertex, m_oLastGraphDrawingContext); } m_oGraph.Vertices.Remove(oVertex); m_oSelectedVertices.Remove(oVertex); }