<select id="elements-select" name="<?php echo $view->get('request_key'); ?>[categorize][elementsgroup]">
  <option disabled="disabled" selected="selected"><?php echo $view->txt('cm_select_element_group'); ?></option>
  <?php foreach( $view->elements as $element ) : ?>
  <option value="<?php echo $element; ?>"><?php echo $view->txt($element); ?></option>
  <?php endforeach; ?>
</select>