Hello liudan2005 Is the closing quote missing from the id in the a4j:outputPanel ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4001365#4001365 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4001365