The code that I use to show the problem is that: | <a:form ajaxSubmit="true" id="formAC"> | <h:outputText value="Tipologia: "></h:outputText> | <h:selectOneMenu id="tipologiaAC" value="#{articoloHelper.tipologiaArticoloDaCollegare}"> | <s:selectItems value="#{tipologiaArticoloAll.resultList}" var="tip" label="#{tip.descrizione}" noSelectionLabel="Seleziona la tipologia..."/> | <s:convertEntity /> | <a:support event="onchange" reRender="articoliACop" ajaxSingle="true"> | </a:support> | </h:selectOneMenu> | <a:outputPanel id="articoliACop"> | <h:outputText value="Oggetto da collegare: " rendered="#{articoloHelper.tipologiaArticoloDaCollegare!=null}"></h:outputText> | <h:selectOneMenu id="articoliAC" value="#{articoloHelper.articoloDaCollegare}" rendered="#{articoloHelper.tipologiaArticoloDaCollegare!=null}"> | <s:selectItems value="#{articoloHelper.articoliCollegabili}" var="tip" label="#{tip.titolo}" noSelectionLabel="Seleziona un oggetto..."/> | <s:convertEntity /> | <a:support event="onchange" reRender="btnACop" ajaxSingle="true"></a:support> | </h:selectOneMenu> | </a:outputPanel> | <a:outputPanel id="btnACop"> | <a:commandButton id="btnAC" value="Collega" action="#{articoloHelper.collegaArticolo(articoloHome.instance)}" | rendered="#{articoloHelper.articoloDaCollegare!=null}" reRender="opArticoliCollegati"></a:commandButton> | </a:outputPanel> | <a:status startText="Aggiornamento dati in corso..."></a:status> | </a:form> | Demetrio View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4076961#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...