AssertValid()
{
Debug.Assert(m_iVertexRowID == WorksheetContextMenuManager.NoRowID ||
m_iVertexRowID > 0);
// m_bEnableSelectAllVertices
// m_bEnableDeselectAllVertices
// m_bEnableSelectAdjacentVertices
// m_bEnableDeselectAdjacentVertices
// m_bEnableSelectIncidentEdges
// m_bEnableDeselectIncidentEdges
// m_bEnableEditVertexAttributes
// m_bEnableSelectSubgraphs
}