public void ExecuteAddChoiceCommand()
{
var vm = Container.Resolve <StringDialogViewModel>();
vm.Add(true, "Add Choice", "Choice:");
if (DialogService.ShowDialog(vm))
{
var newItem = StringViewModel.CreateFromString(Container, vm.Value);
if (Choices == null)
{
_choicesSource = new ObservableCollection <StringViewModel>();
Choices = new ListCollectionView(_choicesSource);
}
_choicesSource.Add(newItem);
// ReSharper disable once PossibleNullReferenceException
Choices.MoveCurrentTo(newItem);
_choicesChanged = true;
OkCommand.RaiseCanExecuteChanged();
}
}