code: public Object elementAt(int iTargetPosition)
      {
          Object bookmark = null;
          if (this.inBufferArray(iTargetPosition))
              bookmark = m_aCurrentRecord[this.bufferToArrayIndex(iTargetPosition)];
          if (bookmark == gEmptyCell)
              bookmark = null;
          return bookmark;
      }
docs: Get the record bookmark at this location.
  @param iTargetPosition The position to retrieve the bookmark from.
  @return The bookmark at this position (or null if not in the buffer).