private void ProductEdit_Click(object sender, RoutedEventArgs e)
        {
            var editorF = new EditorFormProduct(((KeyValuePair <Int32, Product>)((MenuItem)sender).DataContext).Value);

            editorF.Owner = this;
            editorF.ShowDialog();
            this.Show();
        }
        private void miAddProduct_Click(object sender, RoutedEventArgs e)
        {
            var editorF = new EditorFormProduct();

            editorF.Owner = this;
            editorF.ShowDialog();
            this.Show();
        }