Use rich:fileUpload/ to enable/disable my buttons with checking file names

Hello!
I need to upload some files with using <rich:fileUpload>,and i did it but i need to check file names for some reasons and enable or disable upload button but my problem is that when i open my modal panel and click add button of <rich:fileUpload> and then add upload button of <rich:fileUpload>(not my upload button but upload button wich <rich:fileupload> has) i check file name but the button is not enable/disable until i close my modal panel and open it agin,so i need to know how to modify my code to make it work?
<rich:modalPanel id="uploadFile" autosized="true" resizeable="false">
                <f:facet name="header">
                 <h:panelGroup>
                     <h:outputText value="uploadFiles"></h:outputText>
                 </h:panelGroup>
             </f:facet>
             <h:form>
                  <rich:fileUpload maxFilesQuantity="#{uploadBean.maxUploadFiles}" allowFlash="true" fileUploadListener="#{uploadBean.uploadListener}" immediateUpload="false"/>
                         <table>
                            <tr>
                                 <td><h:commandButton disabled="#{!uploadBean.xlsNameValid}" rendered="#{!uploadBean.admin}" action="#{uploadBean.upload}" value="upload" /></td>
                                 <td><h:commandButton action="#{uploadBean.clearFiles}" value="cancel" id="cancel"/></td>
                            </tr>
                       </table>
             </h:form>
             <rich:componentControl for="uploadFile" attachTo="cancel" operation="hide" event="onclick"/>
          </rich:modalPanel>

No the problem is that file is being checked on server side, but if file is invalid the button Upload(my button ,not standart rich:fileUpload) must be disbaled,and shown,but i have to close this modal panel and open it again to see my button enabled/disabled

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