jsf p：layoutUnit动态更新

Question

当我更改不同的标签时，我想更改layoutUnit内容动态。现在它可以在我单击其选项卡时更改测试集。当我回到原始标签。中心的所有内容都消失了。它无法再显示出来。有谁知道这个或如何解决这个问题？感谢。

<h:form id="mainForm">
    <p:layoutUnit id="layoutunitleft" position="west" size="360"  
            resizable="true" collapsible="true" header="Options" minSize="260">
        <p:accordionPanel id="accordingpanel1" rendered="true" >   
            <p:ajax event="tabChange" listener="#{mainNavBean.onChange}" update=":mainForm:projectform " />                                          
            <p:tab id="accordingpanel1tab" title="Project">  
            <p:commandLink id="projecttreelink" process="@this" 
                action="#{mainNavBean.setPage('project')}" 
                update=" :mainForm:projectform:scenarioDetailTable :mainForm:projectform:dynaFormGroup" >    
               <h:outputText value="Project" />     
            </p:commandLink>   
            </p:tab>                          
            <p:tab title="Test Set">                                 
               <p:commandLink id="project" process="@this" 
                action="#{mainNavBean.setPage('testset')}" update=":mainForm:projectform" >    
                    <h:outputText value="Test Set" /> 
                </p:commandLink>                                                         
            </p:tab>                          
            <h:column/>                   
        </p:accordionPanel>                 
        </p:layoutUnit>
        <!-- menu end -->
        <p:growl id="growl" showDetail="true"  />
        <!-- scenario & step start -->
        <p:layoutUnit id="layoutunitcenter" position="center" >
           <p:layout>
              <h:form id="projectform">                            
                <ui:include src="#{mainNavBean.page}.xhtml" />
              </h:form>
            </p:layout>                          
        </p:layoutUnit>         
    </p:layout> 
</h:form> 

public class MainNavBean mplements Serializable {

    private static final long serialVersionUID = 1L;

    private String page = "project";

    public String getPage() {
        return page;
    }
    public void setPage(String page) {
        this.page = page;
    }
}

project.xhtml是这样的：

<p:layoutUnit id="layoutsouth" position="south" size="410"  resizable="true" >
<p:panel header="#{tableBean.tabTitle}" id="dynaFormGroup"  
    style="#{tableBean.selectedItemType eq -1? 'display:none':''}" >
....
</p:panel>
<p:layoutUnit id="layoutunitnorthcenter" position="center" resizable="true" layout="block"> 

<p:dataTable id="scenarioDetailTable" value="#{tableBean.scenariosModel}"  var="scenariob" 
             selection="#{tableBean.selectedScenario}" selectionMode="single" rowkey="#{scenariob.id}"  
             rowStyleClass="#{scenariob.itemType ge 1 ? 'old' : null}" rendered="true"  dynamic="true" >