title: Disabling a Button in JavaFX
body: <p>In Swing, we can disable a button like this:</p>
  
  <pre><code>JButton start = new JButton("Start");
  start.setEnabled(false);
  </code></pre>
  
  <p>Is there anyway to do this with a JavaFX Button?
  The user should only be able to press the button once.</p>