/// <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="sender">
 /// The source of the event; typically <see cref="NavigationHelper"/>.
 /// </param>
 /// <param name="e">Event data that provides both the navigation parameter passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
 /// a dictionary of state preserved by this page during an earlier
 /// session. The state will be null the first time a page is visited.</param>
 private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
     this.DefaultViewModel[FirstGroupName] = null;
     // TODO: Create an appropriate data model for your problem domain to replace the sample data
     var sampleDataGroup = await SampleDataSource.GetGroupAsync("Group-1");
     this.DefaultViewModel[FirstGroupName] = sampleDataGroup;
     if (!dataReloadTimer.IsEnabled)
     {
         StartTimer();
     }
 }
 /// <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="sender">
 /// The source of the event; typically <see cref="NavigationHelper"/>.
 /// </param>
 /// <param name="e">Event data that provides both the navigation parameter passed to
 /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
 /// a dictionary of state preserved by this page during an earlier
 /// session.  The state will be null the first time a page is visited.</param>
 private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
 {
     // TODO: Create an appropriate data model for your problem domain to replace the sample data.
     var item = await SampleDataSource.GetItemAsync((string)e.NavigationParameter);
     this.DefaultViewModel["Item"] = item;
 }