Jsf 2 单击命令按钮操作后，无法渲染PanelGroup

我有两组小组。一个面板组包含一个字段集，内部有两个单选按钮和一个命令按钮。根据单选按钮的选择，尊重的值将通过ajax调用显示在另一个面板组中。但问题是，在选择单选按钮之后，当单击命令按钮时，当第一次加载页面时，另一个面板组根本不呈现。当我刷新时，一切正常。我无法理解为什么renderedPanelGroup值没有设置为true，即使该值是在命令操作中设置的

test.xhtml

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您不能更新未呈现的元素，rendered=false“是一种JSF方法”，用于从DOM树中删除元素

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它不像css display:none或visibility:hidden您不能更新未呈现的元素，rendered=false“是一种JSF方法”从DOM树中删除元素

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它不像css显示：无或可见性：隐藏欢迎您，在这种情况下，您应该接受答案。。。不客气，那样的话你应该接受答案。。。

    <h:form id="parentformid">
 <h:panelGroup id="demandDashBoardPanelGroupID">
    <fieldset> 
    <legend>Demand Dashboard</legend>

     <table>
        <tr>
        <td> 
            <h:selectOneRadio id="groupbyid" value="#{demandManagedBean.selectedRadioButton}" >  
                    <f:selectItem itemLabel="Group By Creation Date Time" itemValue="1" />  
                    <f:selectItem itemLabel="Group By Location" itemValue="2" />
            </h:selectOneRadio>
        </td>
        <td>
            <h:commandButton id="fetchbuttonID" value="Fetch" 
                     action="#{demandManagedBean.displayDemandRequestsTable}">
                          <f:ajax render=":parentformid:demandrequestpanelgrpid"execute="@form" /> 
            </h:commandButton>
        </td>
        </tr>
        </table>

     </fieldset>

     </h:panelGroup>
   //For checking demandManagedBean.renderedPanelGroup value. it is giving always false.Thats why panel group is not getting rendered.
   <h:outputText value="#{demandManagedBean.renderedPanelGroup}" />

    <h:panelGroup id="demandrequestpanelgrpid" rendered="#{demandManagedBean.renderedPanelGroup}"> 

     <fieldset id="demandrequestfieldsetid"> 

     <legend >Demand Requests</legend>

            <h:outputText rendered="#{demandManagedBean.renderFirstTable}" value="first table"/>

            <h:outputText rendered="#{demandManagedBean.renderSecondTable}" value="second table"/>

     </fieldset> 

   </h:panelGroup>

private String selectedRadioButton ="1";
private boolean renderFirstTable ;
private boolean renderSecondTable;
private boolean renderedPanelGroup ;

//getter and setter methods

public void displayDemandRequestsTable(){


        if(selectedRadioButton!= null && selectedRadioButton.endsWith("1")){

            renderFirstTable = true;
            renderSecondTable= false;

        }else if(selectedRadioButton!= null && selectedRadioButton.endsWith("2")){

            renderFirstTable = false;
            renderSecondTable= true;

        }
        renderedPanelGroup = true;
    }

<h:panelGroup id="demandrequestpanelgrpid">
    <h:panelGroup rendered="#{demandManagedBean.renderedPanelGroup}">