protected override void LoadState(Object navigationParameter, Dictionary <String, Object> pageState)
        {
            var movieGroups = APIMASH_RottenTomatoesCollection.GetGroups((String)navigationParameter);

            this.DefaultViewModel["Groups"] = movieGroups;

            if (!_loaded)
            {
                Invoke();
            }
        }
        async private void apiInvoke_OnResponseInTheaters(object sender, APIMASHEvent e)
        {
            var response = (RottenTomatoesMovies)e.Object;

            if (e.Status == APIMASHStatus.SUCCESS)
            {
                // copy data into bindable format for UI
                APIMASH_RottenTomatoesCollection.Copy(response, System.Guid.NewGuid().ToString(), "In Theaters");
                //APIMASH_RottenTomatoesCollection.Copy(response, System.Guid.NewGuid().ToString(), "DVD Top Rentals");
                this.DefaultViewModel["AllGroups"] = APIMASH_RottenTomatoesCollection.GetGroups("AllGroups");
                _loaded = true;
            }
            else
            {
                var  md     = new MessageDialog(e.Message, "Error");
                bool?result = null;
                md.Commands.Add(new UICommand("Ok", new UICommandInvokedHandler((cmd) => result = true)));
                await md.ShowAsync();
            }
        }