code: protected void doHandleThumbnailRequest(final FileWidgetUpload file) {
  		// Create thumb nail (if required)
  		if (file.getThumbnail() == null) {
  			Image thumbnail = createThumbNail(file.getFile());
  			file.setThumbnail(thumbnail);
  		}
  		ContentEscape escape = new ContentEscape(file.getThumbnail());
  		throw escape;
  	}
docs: Handle the thumb nail request.
  
  @param file the file to process