code: public function onRenderAddPathStacks(MvcEvent $e)
      {
          $r = $e->getResult();
          if (!$r instanceof ViewModel)
              return; // we don't get Renderer Result
          // allow viewScripts to append with others on content variable
          else $r->setAppend(true);
  
          // add path stacks
          $viewTemplatePathStack = $this->sm->get('ViewTemplatePathStack');
          foreach (array_reverse($this->pathStacks) as $path) { // child top and final theme must list last
              $viewTemplatePathStack->addPath($path);
          }
      }
docs: MVC Event Listener
  
  @param MvcEvent $e