TicketComments свое поле

<?php
if ($modx->event->name == 'OnBeforeCommentSave') {
  if(!empty($_POST['my_field_prop'])){
  	$properties = array(
      'my_field' => $modx->stripTags($_POST['my_field_prop'])
    );
  } else {
    $properties = array(
      'my_field' => $modx->stripTags($_POST['my_field'])
    );
  }
  
  $modx->event->params['TicketComment']->set('properties', $properties);
}