title: <p:ajax> Event:select is not supported inside a p:pickList
body: <p>When I want to catch select and unselect event in a PrimeFaces 4.0 <code>p:pickList</code> I got an error <code>&lt;p:ajax&gt; Event:select is not supported.</code></p>
  
  <pre><code>&lt;p:pickList  showCheckbox="true" id="pickList"  value="#{ctrl.elts}" var="elt" itemLabel="#{elt}" itemValue="#{elts}" &gt;
      &lt;f:facet name="sourceCaption"&gt;A&lt;/f:facet&gt;
      &lt;f:facet name="targetCaption"&gt;B&lt;/f:facet&gt;
  
      &lt;p:ajax event="select" listener="#{ctrl.select}"  /&gt;
      &lt;p:ajax event="unselect" listener="#{ctrl.onUnselect}" /&gt;
  &lt;/p:pickList&gt;
  </code></pre>
  
  <p></p>
  
  <pre><code>public class ctrl implements Serializable {
  public void select(SelectEvent event) {
       System.out.println(event.getObject().toString());
  }
  
  public void onUnselect(UnselectEvent event) {
       System.out.println(event.getObject().toString());
  }
  </code></pre>
  
  <p>...</p>
  
  <p>So, I am wondering how to know which Items is checked if I can't use Select and unSelect event ?</p>
  
  <p>Thank you </p>