jsf myfaces inputFileUpload無反応


inputFileUpload  
<t:inputfileupload> form<h:form></h:form><h:form> action 。</h:form></t:inputfileupload>
<f:view>   
<h:form id="MyForm" enctype="multipart/form-data" >   
...   
<x:inputFileUpload id="myFileId"  
value="#{myBean.myFile}"  
storage="file"  
required="true"/>   
...   
</h:form>   
</f:view>