private void dgComics_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            var comic = (Comic)dgComics.SelectedItem;

            var comicDetail = new frmComicDetail(comic, _comicManager, _customer);

            comicDetail.ShowDialog();
        }
        private void dgCustOrderFormList_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            var comic = (Comic)dgCustOrderFormList.SelectedItem;

            var comicDetail = new frmComicDetail(comic, _comicManager, _customer);

            comicDetail.btnAddComictoOrder.Visibility = Visibility.Hidden;
            comicDetail.btnRemoveFromOrder.Visibility = Visibility.Visible;
            comicDetail.ShowDialog();
        }