@Override
  protected void setValue(Object element, Object value) {
    ModTableDAO modDao = (ModTableDAO) element;
    modDao.setExistOnDelete((Boolean) value);

    viewer.update(element, null);
  }
 @Override
 protected Object getValue(Object element) {
   ModTableDAO modDao = (ModTableDAO) element;
   return modDao.isExistOnDelete();
 }