code: protected Component newTitle(final String titleId, final IModel<?> titleModel, final int index)
  	{
  		return new Label(titleId, titleModel);
  	}
docs: Factory method for tab titles. Returned component can be anything that can attach to span
  tags such as a fragment, panel, or a label
  
  @param titleId
  id of title component
  @param titleModel
  model containing tab title
  @param index
  index of tab
  @return title component