title: render of a4j commandButton doesnt work; page not rendering
body: <p>when i click the button handler.toggleCreatingTheme() is called, but the outputPanel is not rendering. When i refresh the page(f5) the content of the panel is showed.</p>
  
  <pre><code>                &lt;a4j:commandButton styleClass="simple-submit-button"
                      action="#{handler.toggleCreatingTheme()}"
                      rendered="#{!handler.creatingTheme}"
                      value="txt"
                      immediate="true"
                      render="newThemeForm" oncomplete="initEditor()" status="statusWait" /&gt;
  
                  &lt;a4j:outputPanel id="newThemeForm" ajaxRendered="true" rendered="#{handler.creatingTheme}"&gt;
  </code></pre>
  
  <p>this tags are both in a h:form tag, there is just that one h:form.</p>
  
  <p>How do I let the page refreshing on his own, so rendering the panel at the moment when i click the button?</p>