title: Dispatch event from class not on display list
body: <p>I use a controller class that extends EventDispatcher to handle file upload events. When I add a file to an ArrayCollection in this class and I want to update a component elsewhere, what's the best way to do it? </p>
  
  <p>Seeing that my controller class isn't on the Display List, how can I notify my component to update?</p>
  
  <p>Thanks for any helpful tips!</p>