title: FXMLLoader how to access the components by FXID?
body: <p>I'm trying to figure out how to work with JavaFx.
  I built the application interface in Scene Builder. But I can not get access to the component, since all loaded into the Parent.</p>
  
  <pre><code>Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
  </code></pre>
  
  <p>If I change "Parent" on "Pane" I can get access to the getChildren(), but it is not clear how to get control if i know fx:id...</p>
  
  <p>The question is even simpler. I added Label or TextField in Scene Builder. How do I change it's text from the code if I know the fx:id?</p>
  
  <p>I am in despair.</p>