code: protected Radio<T> newRadio(String wicketId, IModel<T> model, RadioGroup<T> group)
  	{
  		Radio<T> radio = new Radio<T>(wicketId, model, group);
  		return radio;
  	}
docs: Method creating a new {@link Radio}
  
  @param wicketId
  Wicket identifier
  @param model
  Model to use
  @param group
  Group of the {@link Radio}
  @return a {@link Radio}