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new MyBootstrapper().Run();					

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public class MainMenuPageViewModel : BindableBase
  {
    private static readonly Random Prng = new Random();
    
    private readonly ObservableCollection<Category> _categories = new ObservableCollection<Category>(); // Wichtig: Keine normale Liste
    private readonly ObservableRangeCollection<SpecialOffer> _specialOffers =
      new ObservableRangeCollection<SpecialOffer>();

    public MainMenuPageViewModel()
    {
      Categories.Add(new Category
      {
        Title = "A",
        CoverImage = new BitmapImage(new Uri(NetworkDataManager.DataPath + @"Bilder\A.jpg")),
        ClickAction = param =>
        {
          Debug.WriteLine("A clicked");
          OnNavigationRequest(
            new SpecialOfferIndexPageViewModel("A"),
            null);
        }
      });
      Categories.Add(...);
      Categories.Add(...);

      // Daten vom Netzlaufwerk laden
      LoadData();
      // Regelmäßiges Update der Daten
      var timer = new DispatcherTimer(DispatcherPriority.ContextIdle)
      {
        Interval = TimeSpan.FromMinutes(10)
      };
      timer.Tick += (sender, args) => { LoadData(); };
      timer.Start();
    }

    public ObservableRangeCollection<SpecialOffer> SpecialOffers
    {
      get { return _specialOffers; }
    }					

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  public abstract class Offer : BindableBase
  {
    private Color _color;
    private Guid _contact;
    private DateTime? _expirationDate;

    public Offer()
    {
      Color = Colors.Black;
      ExpirationDate = DateTime.Today.AddMonths(6);
      Guid = Guid.NewGuid();
    }

    [XmlIgnore]
    public Color Color
    {
      get { return _color; }
      set { SetProperty(ref _color, value); }
    }

    [XmlElement("Color")]
    public string XmlColor
    {
      get { return Color.ToString(); }
      set
      {
        var tmp = ColorConverter.ConvertFromString(value);
        if (tmp != null) Color = (Color) tmp;
      }
    }					

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  class SpecialOfferDetailPageViewModel : BindableBase
  {
    private SpecialOffer _model;

    public SpecialOfferDetailPageViewModel()
    {
      // Designer
      if (DesignerProperties.GetIsInDesignMode(new DependencyObject()))
      {
        var vm = new MainMenuPageViewModel();
        Model = vm.SpecialOffers.First();
        Model.ContactName = "MR. X";
        Model.ContactEmail = "mrx@example.com";
      }
    }

    public SpecialOffer Model
    {
      get { return _model; }
      set { SetProperty(ref _model, value); }
    }

  }