title: Accessing FXML controller class
body: <p>I would like to communicate with a FXML controller class at any time, to update information on the screen from the main application or other stages.</p>
  
  <p>Is this possible?   I havent found any way to do it.</p>
  
  <p>Static functions could be a way, but they don't have access to the form's controls.</p>
  
  <p>Any ideas?</p>