title: Wicket JQuery AbstractFormDialog does not render RadioChoice of Enumeration
body: <p>I have a dialog box with a form. The form contains a radio choice consisting of some enum types. When the dialog opens, then only a single circle gets displayed. I expected three circles with the names of the enums. What's the error in my code?</p>
  
  <pre><code>public class MyNewDialog extends AbstractFormDialog {
    public MyNewDialog( String id ) {
      super( id, "Dialog title" );
      form = new Form( "dialogForm" );
      this.add( form );
      RadioChoice&lt;Gender&gt; genders = new RadioChoice&lt;Gender&gt;( "list",
      getGenderList(), new EnumChoiceRenderer&lt;Gender&gt;( this ) );
      genders.setSuffix( " - " );
      genders.setRequired( true );
      form.add( genders );
    }
  private List&lt;Gender&gt; getGenderList() {
    return Arrays.asList&lt;Gender&gt;( Gender.values() );
  }
  
  //--- Enum class "Gender"
  public enum Gender { MALE, FEMALE, FAMILY };
  
  //--- The html markup in file "MyNewDialog.html"
  &lt;html xmlns:wicket="org.apache.wicket"&gt;&lt;body&gt;&lt;wicket:panel&gt;
    &lt;form wicket:id="dialogForm"&gt;
      &lt;input wicket:id="list" type="radio" /&gt;
    &lt;/form&gt;
  &lt;/wicket:panel&gt;&lt;/body&gt;&lt;/html&gt;
  </code></pre>