I have a paged table that extends the TableSort class. The thing is, I would like to add some special parameters to the header links, so I need to extend the TableSort class. The problem is, it is not recognizing my new extended TableSort (MyTableSort) class. This is the code, any help would be greatly appreciated:

<?php // $Id: RadiosDemo.module $ //This module demonstrates the radios default value problem.  class MyTableSort extends TableSort { /** * Compose a URL query parameter array for table sorting links. * * @return *   A URL query parameter array that consists of all components of the current *   page request except for those pertaining to table sorting. */   public function tablesort_get_query_parameters() {     return drupal_get_query_parameters($_GET, array('q', 'sort', 'order', 'nid'));   } }  /** * Implementation of hook_menu(). */ function RadiosDemo_menu() {    // Added a link to navigate to the demo node display page   $items['RadiosDemo/Problem'] = array(     'title' => 'Demo of Pager Problem',     'page callback' => 'RadiosDemo_displaynodes',     'access callback' => TRUE,     'type' => MENU_NORMAL_ITEM,   );    return $items; }  /**  * Function which will display all the nids in a paged table  */ function RadiosDemo_displaynodes() {    $headers = array(     array('data' => 'nid', 'field' => 'nid', 'sort' => 'ASC'),     array('data' => 'status', 'field' => 'status'),     array('data' => 'title', 'field' => 'title'),   );    // Select nid from published nodes with 20 pager limit   $query = db_select('node', 'n')     ->condition('status', 1)     ->extend('MyTableSort')     ->extend('PagerDefault')     ->orderByHeader($headers)     ->limit(30)     ->fields('n', array('nid', 'title', 'status'));    $results = $query->execute();    $rows = array();    foreach ($results as $result) {     $row = array();     $row[] = $result->nid;     $row[] = $result->status;     $row[] = $result->title;      $rows[] = $row;   }    $html = theme('table', array(    'header' => $headers,    'rows' => $rows,   ));    $html .= theme('pager', array(     'parameters' => array(       'banana' => 'banana'   )));    return $html; }