root = Card([header, form])
header = CardHeader("Team Lunch Poll", "Where should we go for lunch on Friday?")
form = Form("lunch-poll", formButtons, [restaurantField])
restaurantField = FormControl("Choose a restaurant", restaurantRadio)
restaurantRadio = RadioGroup("restaurant", [resto1, resto2, resto3])
resto1 = RadioItem("Mario's Italian", "Classic pasta & pizza", "marios")
resto2 = RadioItem("Sakura Sushi", "Fresh sushi & ramen", "sakura")
resto3 = RadioItem("Burger Barn", "Gourmet burgers & fries", "burgerbarn")
formButtons = Buttons([submitBtn])
submitBtn = Button("Vote", null, "primary")