<a:notificationBar position="top" effect="slide" styleClass="top" widgetVar="bar"> <h:outputText value="PrimeFaces Rocks!" style="font-size:36px;" /> </a:notificationBar> <a:commandButton value="Show" onclick="PF('bar').show()" type="button" icon="ui-icon-arrow-1-s"/> <a:commandButton value="Hide" onclick="PF('bar').hide()" type="button" icon="ui-icon-arrow-1-n"/>