p：commandButton在第一次单击时不更新

Question

我在bean中有以下方法：

public void methodBean(String key){
    MyObject object = new MyObject();

     System.out.println("parent key: " + key);

    if (key != null && !key.equals("")) {
        object = MyClient.getInfo(key);
        myMapChild = MyDomain.dataToModel(object);
    }else{
        myMapChild = new HashMap<String, String>();
    }
}

点击父p：commandbutton：（xhtml）

<p:tab id="step2" title="TEST STEP 2"> 
   <p:panel id="panelCategory">
      <h:panelGrid id="testStep2" columns="1">
         <h:panelGrid columns="1" columnClasses="label" >
             <p:panelGrid>
                 <f:facet name="header">
                     <p:row>
                         <p:column colspan="6">Title</p:column>
                     </p:row>
                 </f:facet>
                 <p:row>
                     <c:forEach items="#{myBean.myMapParent}" var="entry">
 <p:commandButton value="#{entry.value}" action="#{myBean.methodBean(entry.key)}" update="catalogChildList"
                                                         />  
                     </c:forEach> 
                 </p:row>
             </p:panelGrid>
             <p:panelGrid id="catalogChildList">
                 <p:row>
                     <c:forEach items="#{myBean.myMapChild}" var="entry" >
                         <p:column>
                             <p:commandButton value="#{entry.value}"/>
                     </c:forEach>                                
                  </p:row>                                                 
              </p:panelGrid>                           
          </h:panelGrid>                         
      </h:panelGrid>
  </p:panel>              

必须更新列表并显示相应的按钮，问题是第一次点击不会更新子按钮，但第二次点击会更新内容。

谢谢大家的答案