JSF - 麻烦使用panelGrid并呈现

Question

您好我的代码中有一个panelGrid，我的日历和另一个panelGrid有我的dataTable，我的panelGrid / dataTable（id =显示3）只会出现，如果我的列表不为null，但只有当我有面板显示

<p:panel id="display" visible="false" header="Dia Selecionado #{cd.getdF()}" />

如果我把它从display3停止工作。为什么会这样？

<h:form>
    <h:panelGrid columns="2">
        <p:calendar value="#{cd.date1}" pattern="dd/MM" locale="pt" mode="inline">     
            <p:ajax event="dateSelect" listener="#{cd.updateDate}" update="@form"/>
        </p:calendar>
        <p:panel id="display" visible="false" header="Dia Selecionado #{cd.getdF()}" />
        <p:outputPanel id="gridContainer" layout="block" >
            <h:panelGrid id="display3" rendered="#{cd.lista.size()>0}" columns="2" >

                <p:panel id="display21" header="Dia Selecionado #{cd.getdF()}" style="width:250px; text-align: center">  
                    <p:dataTable var="d" value="#{cd.lista}" emptyMessage="Não há compromissos para o dia." >  
                        <p:column headerText="00:00" >  
                            <h:outputText value="#{d.hr0}" />  
                        </p:column>  
                    </p:dataTable>  
                </p:panel>
                <p:panel id="display1" visible="false" header="Dia Selecionado #{cd.getdF()}" />
                <p:panel id="display22" header="Dia Selecionado #{cd.getdF()}" style="width:250px; text-align: center">  
                    <p:dataTable var="d" value="#{cd.lista}" emptyMessage="Não há compromissos para o dia.">  
                        <p:column headerText="13:00" >  
                            <h:outputText value="#{d.hr13}" />  
                        </p:column>  
                    </p:dataTable>
                </p:panel>

            </h:panelGrid>
        </p:outputPanel>
    </h:panelGrid>