title: p:ajax inside h:commandButton not call backing bean method
body: <p>I'm trying to call my backing bean method using <code>&lt;p:ajax&gt;</code> but it doesn't work. My <code>&lt;p:ajax&gt;</code> is wrapped inside an <code>&lt;h:commandButton&gt;</code> like this:</p>
  
  <pre><code>&lt;h:commandButton value="#{msg['supprimer.image']}"
      styleClass="btn btn-sm btn-danger" update=":uploader"
       process="@this"&gt;
  
      &lt;p:ajax event="click" update="imagesList" process="@this"
      listener="#{creationBesoinBean.supprimerImage(uploadedImage)}"/&gt; 
  &lt;/h:commandButton&gt;
  </code></pre>
  
  <p>But supprimerImage method is not invocked. Could somehone help me please?</p>