title: Javafx: button handler in a button handler
body: <pre><code>Button a=new Button();
  ...
  a.setOnAction(new EventHandler&lt;ActionEvent&gt;()
      {
          public void handle(ActionEvent e)
          {
               Button []b=new Button();
           ...
          }
      });     
  </code></pre>
  
  <p>After clicking the button a, the other buttons b will show up. I want to make an event handler for the buttons b. What should I do?</p>