public function getCMSFields() {
      $fields = parent::getCMSFields();

      HTMLEditorField::include_js();

      $fields->removeByName('Content');

      $fields->addFieldsToTab('Root.Content', new FieldSet(
         new HTMLEditorField('Content', 'Content')
      ));

      
      return $fields;

   }

   public function getCMSFields_forPopup() {
      return self::getCMSFields();   
   }

   public static function getCMSTableField($controller, $name) {
      
      $table = new ComplexTableField(
         $controller,
         $name,
         __CLASS__,
         null,
         'getCMSFields_forPopup',
         null,
         'Date DESC'
      );

...