title: <p:growl> and <p:messages> in a same page
body: <p>I want use <code>&lt;p:messages&gt;</code> to display error message, use <code>&lt;p:growl&gt;</code> to display success messages.
  In the backing bean:</p>
  
  <pre><code>FacesContext context = FacesContext.getCurrentInstance(); 
  context.addMessage(null, new FacesMessage(title, msg));
  </code></pre>
  
  <p>But I found whatever I add message in the backing bean, <code>&lt;p:messages&gt;</code> and <code>&lt;p:growl&gt;</code> both display it.</p>
  
  <p>Any suggestion.</p>