@Override
    public Class getColumnClass(int column) {
      if (NotificationsTreeTable.DISPLAY_TYPE_COLUMN == column) {
        return NotificationDisplayType.class;
      }
      if (NotificationsTreeTable.LOG_COLUMN == column) {
        return Boolean.class;
      }
      if (NotificationsTreeTable.READ_ALOUD_COLUMN == column) {
        return Boolean.class;
      }

      return TreeTableModel.class;
    }
@Override
    public Class getColumnClass(int column)