AssertValid()
{
base.AssertValid();
Debug.Assert(m_oVisualCollection != null);
// m_oAllVertexDrawingVisuals
// m_oUnselectedEdgeDrawingVisuals
// m_oSelectedEdgeDrawingVisuals
Debug.Assert(m_oVertexDrawer != null);
Debug.Assert(m_oEdgeDrawer != null);
Debug.Assert(m_oGroupDrawer != null);
// m_oBackColor
// m_oBackgroundImage
}