Handling MessageBox in Caliburn.Micro

EisenbergEffect indicated he is injecting delegate to implement messagebox in his ongoing Caliburn.Micro application, with a very general code example:

  public delegate void ShowMessageBox(string message, string title, MessageBoxOptions options = MessageBoxOptions.Ok, Action<IMessageBox> callback = null);

In case you still don’t get the idea, here is a developer doing the exactly same thing.

My solution came up with code like this:

public class MyViewModel: Screen {
 public MyViewModel(Action<string> showMessage, Func<string, string, bool> showConfirm)
 {
     _showMessage = showMessage;
     _showConfirm = showConfirm;
 }

  public void Delete(){
     if (!_showConfirm("Are you very very sure to delete it?", "Confirmation")) return;
     // Do delete...
    _showMessage("Deleted as you reuqested!")
  }
}
   public class HelloWp7Bootstrapper : PhoneBootstrapper
   {
        PhoneContainer _container;

        protected override void Configure()
        {
            _container = new PhoneContainer();

            ...
            _container.RegisterInstance(typeof(Action<string>), null, (Action<string>)(msg => MessageBox.Show(msg)));
            _container.RegisterInstance(typeof(Func<string, string, bool>), null,
                (Func<string, string, bool>)((msg, capt) => MessageBox.Show(msg, capt, MessageBoxButton.OKCancel) == MessageBoxResult.OK));

            ...