private void ProductsGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
currentProduct = (Product)e.AddedItems[0];
TitleTextBox.DataContext = currentProduct.ProductDescriptors[0];
TitleTextBox.SetBinding(TextBox.TextProperty, "Title");
BodyTextBox.DataContext = currentProduct.ProductDescriptors[0];
BodyTextBox.SetBinding(TextBox.TextProperty, "Body");
relateds = WrapRelateds(currentProduct, from p in catalog.Products select p);
RelatedGrid.ItemsSource = relateds;
}