docs: public void removeAll()
      {
          if (m_gridList != null)
              m_gridList.removeAll();
          if (m_gridBuffer != null)
              m_gridBuffer.removeAll();
          if (m_gridNew != null)
              m_gridNew.removeAll();
          m_iEndOfFileIndex = UNKNOWN_POSITION;
          m_iPhysicalFilePosition = UNKNOWN_POSITION;
          m_iLogicalFilePosition = UNKNOWN_POSITION;
      }