/**
 * Append a duplicate item to the current dropdown menu
 *
 * @param   string  $id      ID of corresponding checkbox of the record
 * @param   string  $prefix  The task prefix
 *
 * @return  void
 *
 * @since   3.2
 */
public static function duplicate($id, $prefix = '')
{
    $task = ($prefix ? $prefix . '.' : '') . 'duplicate';
    static::addCustomItem(Text::_('JTOOLBAR_DUPLICATE'), 'copy', $id, $task);
}