code: public int bookmarkToIndex(Object bookmark, int iHandleType)
      {
          if (bookmark == null)
              return -1;
          int iTargetPosition = m_gridBuffer.bookmarkToIndex(bookmark, iHandleType);
          if (iTargetPosition == -1)
              iTargetPosition = m_gridList.bookmarkToIndex(bookmark, iHandleType);
          return iTargetPosition;   // Target position
      }
docs: Search through the buffers for this bookmark.
  @return int index in table; or -1 if not found.
  @param bookmark java.lang.Object The bookmark to search for.
  @param iHandleType The bookmark type.