title: Send an f:param when a ValueChangeListener is invoked
body: <p>I want to send a request parameter, everytime a <code>ValueChangeListener</code> is invoked. I've implemented it the following way, but unfortunately it doesn't work.</p>
  
  <p>Here's the code so you can get the idea.</p>
  
  <pre><code>&lt;h:selectOneMenu value="#{MyBean.code}" 
     valueChangeListener="#{MyBean.codeChanged}" onchange="this.form.submit()"&gt;
     &lt;f:selectItems value="#{MyBean.codeItems}" /&gt;
     &lt;f:param name="validation" value="true" /&gt;
  &lt;/h:selectOneMenu&gt;
  </code></pre>