public Card()
{
merchendise = (MerchendiseWindowViewModel)Application.Current.Resources["MerchendiseWindowViewModel"];
CardViewModel cardViewModel = new CardViewModel();
this.DataContext = cardViewModel;
InitializeComponent();
}
public Card(MerchendiseWindowViewModel merchendiseWindow)
{
merchendise = merchendiseWindow;
merchendiseWindow.AddItem = this;
CardViewModel cardViewModel = new CardViewModel(merchendiseWindow);
this.DataContext = cardViewModel;
InitializeComponent();
}