Website Ink

xnau, please help.

Here is my code, but for some reason it still shows all the fields instead of only first_name & calendar_month

<?php if ( $filter_mode == 'sort' || $filter_mode == 'both' ) : ?>

    <fieldset class="widefat">
      <legend><?php _e('Sort by', 'participants-database' )?>:</legend>

      <?php
      /*
       * this function sets the fields in the sorting dropdown. It has two options:
       *    1. columns: an array of field names to show in the sorting dropdown. If
       *       'false' shows default list of sortable fields as defined
       *    2. sorting: you can choose to sort the list by 'column' (the order they
       *       appear in the table), 'alpha' (alphabetical order), or 'order' which
       *       uses the defined group/field order
       */
      $this->set_sortables(true, 'first_name, calendar_month');
      ?>

      <?php $this->sort_form() ?>