private void BtnUsun_Click(object sender, RoutedEventArgs e)
        {
            var Res = MessageBox.Show("Usunąć ?", "Usuwanie pozycji", MessageBoxButton.YesNo, MessageBoxImage.Exclamation);

            if (Res == MessageBoxResult.Yes)
            {
                PanelTrace_db.UsunTraceMaterial(rowTraceMaterial);
                listTraceMaterial    = PanelTrace_db.PobierzTraceMaterial();
                grdLista.ItemsSource = listTraceMaterial;
            }
        }