private void OnAddExtraImageCommand()
 {
     var model = new CreateExtraImageModel();
     var uiVisualizerService = this.GetDependencyResolver().Resolve<IUIVisualizerService>();
     uiVisualizerService.ShowDialog<CreateExtraImageViewModel>(model, (s, e) =>
     {
         if (e.Result == true)
             Model.AddExtraImage(model.ExtraImageSource);
     });
 }
 public CreateExtraImageViewModel(CreateExtraImageModel model)
 {
     Model = model;
     SelectExtraImageSourceCommand = new Command(OnSelectExtraImageSourceCommand);
 }