Change Tab with JS doesn't work (RF4)

[rott]

I'm trying to change the tab of rich:tabPanel with Javascript but nothing happens when i do it this way:

<h:form>

<a4j:commandButton id="test" value="test"

                        styleClass="button"

                         immediate="true"                        

                        oncomplete="#{rich:component('layoutTabPanel')}.nextItem();" />

<rich:tabPanel id="layoutTabPanel" switchType="ajax"  

                        activeItem="#{layout.selectedTab}" styleClass="tabPanel"

                        itemChangeListener="#{layout.processItemChange}"

                        onbeforeitemchange="if (#{layout.confirmLeaveDetail}) { #{rich:component('modalPanel_leave_details')}.show(); return false; } else { return true; }"

                        immediate="true"

                        >....</rich:tabPanel>

</h:form>

Can anybody tell me what's wrong?