fileUpload with progress facet not working

[dragos.oana]

Hi,

I am using RichFaces 3.3.3 and Tomcat 6. I want to use fileUpload without any progress bar but when I click the button to upload a file nothing happens. What am I missing here?

<rich:fileUpload id="uploadSystemUpdate" acceptedTypes="*" maxFilesQuantity="1" immediateUpload="true"
                           addControlLabel="#{lbls.add_systemUpdate}" listHeight="80px" listWidth="500px"
                           autoclear="true" stopButtonClass="rich-fileupload-button"
                           onerror="alert('Error uploading file');" fileUploadListener="#{configuration_Backing.uploadSystemUpdateCompleted}">
              <a4j:support limitToList="true" event="onupload" action="#{configuration_Backing.uploadSystemUpdateStarted}"/>
              <a4j:support limitToList="true" event="onerror" action="#{configuration_Backing.uploadSystemUpdateError}"/>
              <f:facet name="progress">
                  <rich:progressBar rendered="false" />
              </f:facet>
          </rich:fileUpload>