RemoveEdgeDuringGroupCollapseOrExpand ( IEdge oEdge, Boolean bUndrawEdge ) { Debug.Assert(oEdge != null); AssertValid(); if (bUndrawEdge && m_oLastGraphDrawingContext != null) { m_oGraphDrawer.UndrawEdge(oEdge, m_oLastGraphDrawingContext); } m_oGraph.Edges.Remove(oEdge); m_oSelectedEdges.Remove(oEdge); }