Creates a collection of groups and items with hard-coded content. SampleDataSource initializes with placeholder data rather than live production data so that sample data is provided at both design-time and run-time.
        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            // Allow saved page state to override the initial item to display
            if (pageState != null && pageState.ContainsKey("SelectedItem"))
            {
                navigationParameter = pageState["SelectedItem"];
            }

            // TODO: Create an appropriate data model for your problem domain to replace the sample data
            var item = new SampleDataSource(this.Frame).GetItem((String)navigationParameter);
            this.DataContext = item.Group;
            this.flipView.SelectedItem = item;
        }
 /// <summary>
 /// Populates the page with content passed during navigation.  Any saved state is also
 /// provided when recreating a page from a prior session.
 /// </summary>
 /// <param name="navigationParameter">The parameter value passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
 /// </param>
 /// <param name="pageState">A dictionary of state preserved by this page during an earlier
 /// session.  This will be null the first time a page is visited.</param>
 protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
 {
     // TODO: Create an appropriate data model for your problem domain to replace the sample data
     var group = new SampleDataSource(this.Frame).GetGroup((String)navigationParameter); ;
     this.DataContext = group;
 }