private void copyCells(JRCrosstab crosstab, JRBaseObjectFactory factory) {
   JRCrosstabCell[][] crossCells = crosstab.getCells();
   if (crossCells != null) {
     this.cells = new JRCrosstabCell[rowGroups.length + 1][columnGroups.length + 1];
     for (int i = 0; i <= rowGroups.length; i++) {
       for (int j = 0; j <= columnGroups.length; ++j) {
         this.cells[i][j] = factory.getCrosstabCell(crossCells[i][j]);
       }
     }
   }
 }
  public static JRElement getElementByKey(JRCrosstab crosstab, String key) {
    JRElement element = null;

    if (crosstab.getHeaderCell() != null) {
      element = crosstab.getHeaderCell().getElementByKey(key);
    }

    if (element == null) {
      element = getHeadersElement(crosstab.getRowGroups(), key);
    }

    if (element == null) {
      element = getHeadersElement(crosstab.getColumnGroups(), key);
    }

    if (element == null) {
      if (crosstab instanceof JRDesignCrosstab) {
        List cellsList = ((JRDesignCrosstab) crosstab).getCellsList();
        for (Iterator it = cellsList.iterator(); element == null && it.hasNext(); ) {
          JRCrosstabCell cell = (JRCrosstabCell) it.next();
          element = cell.getContents().getElementByKey(key);
        }
      } else {
        JRCrosstabCell[][] cells = crosstab.getCells();
        for (int i = cells.length - 1; element == null && i >= 0; --i) {
          for (int j = cells[i].length - 1; element == null && j >= 0; --j) {
            JRCrosstabCell cell = cells[i][j];
            if (cell != null) {
              element = cell.getContents().getElementByKey(key);
            }
          }
        }
      }
    }

    if (element == null && crosstab.getWhenNoDataCell() != null) {
      element = crosstab.getWhenNoDataCell().getElementByKey(key);
    }

    return element;
  }