code: @Override
  	public String getValueAsString() {
  		List<FileWidgetUpload> files = getValue();
  
  		if ((files == null) || files.isEmpty()) {
  			return null;
  		}
  
  		StringBuffer stringValues = new StringBuffer();
  
  		boolean append = false;
  		for (FileWidgetUpload file : files) {
  			if (append) {
  				stringValues.append(", ");
  			}
  			stringValues.append(file.getFile().toString());
  			append = true;
  		}
  
  		return stringValues.toString();
  	}
docs: {@inheritDoc}