/**
   * Shows given list of reading lists.
   *
   * @param lists lists.
   */
  protected void setReadingLists(ReadingList[] lists) {
    tblReadingLists.setEnabled(lists != null);
    btnAddReadingList.setEnabled(lists != null);
    btnRemoveList.setEnabled(lists != null);

    readingListsModel.setLists(lists);
  }