How to render Enum values as RadioGroup and set default value

[Ralf Eichinger]

I have an User class with a gender field using a Gender-Enum:

public class User implements DomainObject<Long> {
...
  private Gender gender;

I want to bind this gender field to a radiogroup (representing all enum
values) in a registration form.
This is what I did so far:

<code>
public enum Gender {
        MALE, FEMALE
};

public class RegistrationEntryPanel extends Panel {
  private User user = new User();

  public RegistrationEntryPanel(String id) {
    super(id);

    // default value
    user.setGender(Gender.MALE);

    CompoundPropertyModel userModel = new CompoundPropertyModel(user);
    final RadioGroup<Gender> genderGroup = new RadioGroup<Gender>(
      "genderGroup", userModel.bind("gender"));

    Form form = new Form("form", userModel) {
      @Override
      protected void onSubmit() {
        System.out.println("USER: " + user);
      }
    };
    add(form);
    form.add(genderGroup);

    // gender
    Gender[] genderValues = Gender.values();
    List<Gender> genders = Arrays.asList(genderValues);

    ListView<Gender> genderList = new ListView<Gender>("genderList",
      genders) {
      @Override
      protected void populateItem(ListItem<Gender> item) {
        item.add(new Radio<Gender>("radio", item.getModel()));
        item.add(new Label("label", getString(item.getModelObject()
          .toString())));
      }
    };
    genderGroup.add(genderList);

  }
}
</code>

This works so far: I can select a radio button and the value in the user
object is changed on submit.
But as I have to use different models for the group and the listview,
the default setting with "user.setGender" has no effect.

How can I preselect the first radio button of the listview or better the
dedicated MALE radio button?


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