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();
}