paymentGroup.add(new Radio("credit", "Credit Card "));
paymentGroup.setVerticalLayout(false);
fieldset.add(paymentGroup);
// Retrieve the paymentGroup's ListItem, and set its CSS class to "radio"
ListItem item = (ListItem) fieldset.getHtmlList().getLast();
item.setAttribute("class", "radio");
fieldset.add(new TextField("cardholderName"));
fieldset.add(new CreditCardField("cardNumber")).setRequired(true);
fieldset.add(new IntegerField("expiry"));