title: How do I remove a scene in a stage in javafx?
body: <p>I want to write a game that includes these classes: </p>
  
  <pre><code>--Game extends Application(pass its stage to below classes)
  --StartUp extends Application(has stackpane that added to scene and scene added to stage)
  --Menu extends Application
  --GamePly extends Application
  </code></pre>
  
  <p>I want all of these classes use on stage.
  First of all, I start startUp class and after a few seconds I want to remove startUp stackpane and change the scene (for example read from an fxml file) but I'm a noob in javafx. Any ideas?</p>