title: How to identify clicked commandButton in my managed bean
body: <p>I have an <code>actionListener</code> method in my managed bean which is called by many command buttons.</p>
  
  <pre><code>public void verifyTestDisponibility(ActionEvent actionEvent) {
      if (button1 clicked) {
          // ...
      }
      if (button2  clicked) {
          // ...
      }
  }
  </code></pre>
  
  <p>The part I'm stucking at is identifying the clicked command button. How can I identify it?</p>