/** * Inserts a field after a particular field in a FieldList. * * @param string $insertAfter Name of the field to insert after * @param FormField $field The form field to insert * @return FormField|null */ public function insertAfter($insertAfter, $field) { if ($field instanceof Tab) { $field->setTabSet($this); } return parent::insertAfter($insertAfter, $field); }