void PictureCartGrid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            PictureCart c = (PictureCart)sender;

            viewModel.ShowCard(c);
        }
        void Image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            PictureCart cart = (PictureCart)sender;

            viewModel.ShowCard(cart);
        }