code: public static void addCssFiles(final IHeaderResponse response, final Class<?> scope,
  		final String... cssFilenames)
  	{
  		for (final String cssFilename : cssFilenames)
  		{
  			final HeaderItem item = CssHeaderItem
  				.forReference(new PackageResourceReference(scope, cssFilename));
  			response.render(item);
  		}
  	}
docs: Adds the given css files to the given response object in the given scope.
  
  @param response
  the {@link org.apache.wicket.markup.head.IHeaderResponse}
  @param scope
  The scope of the css files.
  @param cssFilenames
  The css file names.