public function configure()
  {
    parent::configure();

    $parentChoices = $this->getParentChoices();


    $this->widgetSchema['root_id'] = new sfWidgetFormChoice(array(
      'choices' => $parentChoices
    ));
    $this->validatorSchema['root_id'] = new sfValidatorChoice(array(
      'choices' => array_keys($parentChoices)
    ));

  }

  protected function getParentChoices()
  {
    //Get settings from config file for hiding models pages
    $models_off = sfConfig::get('dm_hide_pages_tree_models', null);
    $actions_off = sfConfig::get('dm_hide_pages_tree_actions', null);
    $where_string = '';

    //Compile query string for excluding models with many childrens(from config file)
    foreach($models_off as $key=>$name)
    {
    $list_actions = $actions_off[$name];
    ($list_actions !== null && count($list_actions) > 0) && $actions_links = ' AND p.action IN ("'.implode('","',$list_actions).'")';
    if ($where_string!='')
        {
        $where_string = ' NOT (p.module = "'.$name.'"'.$actions_links.')';
        }
    else
        {
            $where_string = ' AND NOT (p.module = "'.$name.'"'.$actions_links.')';
        }
    }

    $_parentChoices = dmDb::table('DmPage')->createQuery('p')
        ->withI18n()
        ->where($where_string)
        ->select('p.id, p.level, pTranslation.name')
        ->orderBy('p.lft')
        ->fetchPDO();

    $parentChoices = array();

    foreach($_parentChoices as $values)
    {
      $parentChoices[$values[0]] = str_repeat('  ', $values[1]).'- '.$values[2];
    }

    return $parentChoices;
  }