public RadioEditorViewModel(IEditorViewModelFactory editorFactory)
        {
            _editorFactory = editorFactory;

            Title = "RadioButton Control";

            AddChoiceCommand    = new DelegateCommand(AddChoice, () => true);
            RemoveChoiceCommand = new DelegateCommand <ChoiceEditorViewModel>(choice => Choices.Remove(choice), choice => Choices.IndexOf(choice) > 0);

            Choices.CollectionChanged += (sender, args) => OnUpdateSnippet();

            AddChoice();
        }