/**
* Displays the edit feature form.
*/
public function featureEdit(NodeInterface $node, $fid, $pfid)
{
$func = uc_product_feature_data($fid, 'callback');
$form_state = new FormState();
$form_state->setBuildInfo(array('args' => array($node, uc_product_feature_load($pfid))));
return $this->formBuilder()->buildForm($func, $form_state);
}