/**
  * Removes route parameters for dynamic step navigation.
  * @param array $parameters Current route parameters.
  * @param FormFlow $flow The flow involved.
  * @return array Route parameters without instance and step parameter.
  */
 public function removeRouteParameters(array $parameters, FormFlow $flow)
 {
     unset($parameters[$flow->getDynamicStepNavigationInstanceParameter()]);
     unset($parameters[$flow->getDynamicStepNavigationStepParameter()]);
     return $parameters;
 }