@Override
 public void writeHeaderCell(String text, int col) {
   super.writeHeaderCell(dataTableExportHelper.getHeaderCellText(text, col), col);
 }
 @Override
 public void flushFile() {
   dataTableExportHelper.cleanup();
   super.flushFile();
 }
 @Override
 public void writeCell(Object output, int col, int row) {
   super.writeCell(dataTableExportHelper.getCellText(output, col, row), col, row);
   used = true;
 }