OnNavigatedTo

gistfile1.cs

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    SmartDispatcher.BeginInvoke(() =>
    {
        if (DataContext == null)
            DataContext = new MainPageViewModel();

        // ViewModel is the DataContext typecast'd to MainViewModel
        if (ViewModel != null && ViewModel.IsInitialized == false)
            ViewModel.Initialize(); 

        if (ApplicationBar == null)
            BuildApplicationBar();
    });

    base.OnNavigatedTo(e);
}