code: private void showProgress() {
  
          CmsFileInfo fileInfo = m_fileInput.getFiles()[0];
          m_progressInfo = new CmsUploadProgressInfo(Collections.singletonList(fileInfo.getFileName()));
          m_progressInfo.setContentLength(fileInfo.getFileSize());
          m_mainPanel.setContainerWidget(m_progressInfo);
          m_updateProgressTimer = new Timer() {
  
              @Override
              public void run() {
  
                  updateProgress();
              }
          };
          m_updateProgressTimer.scheduleRepeating(1000);
  
      }
docs: Starts the upload progress bar.<p>