title: p:growl does not show global faces message
body: <p>I've the below command button and growl component:</p>
  
  <pre><code>&lt;p:commandButton id="reservationAdd" actionListener=" {reservationBean.addReservation()}" value="Dodaj" oncomplete="PF('wdlgAddReservation').hide();"  update=":frm" action="#{linkedTimelinesController.createTimeline()}"&gt; 
      &lt;f:ajax execute="reservationAdd" onevent="click" listener="#{messageControler.eventAdded()}"  render="dynamic"/&gt;
  &lt;/p:commandButton&gt;
  
  &lt;p:growl id="msj" autoUpdate="true"/&gt;  
  </code></pre>
  
  <p>I'm adding a faces message as below:</p>
  
  <pre><code>@ManagedBean
  public class MessageControler {
  
      public void eventAdded(){  
        FacesContext.getCurrentInstance().addMessage(null,new FacesMessage(FacesMessage.SEVERITY_INFO,"Rezerwacja została dodana",null));  
      }
  }
  </code></pre>
  
  <p>However, it does not show up in the growl component. How is this caused and how can I solve it?</p>