private void chkTIS_Checked(object sender, RoutedEventArgs e)
        {
            try
            {
                chkTIS.IsEnabled = false;

                prmTIS = new PromoTIS();
                pnlPromoVouchContent.Child = prmTIS;
                prmTIS.Margin = new Thickness(0);
            }
            catch (Exception ex)
            {
                ExceptionManager.Publish(ex);
            }
            finally
            {
                chkTIS.IsEnabled = true;
            }
        }
        private void chkTIS_Checked(object sender, RoutedEventArgs e)
        {
            try
            {
                chkTIS.IsEnabled = false;

                prmTIS = new PromoTIS();
                pnlPromoVouchContent.Child = prmTIS;
                prmTIS.Margin = new Thickness(0);
            }
            catch (Exception ex)
            {
                ExceptionManager.Publish(ex);
            }
            finally
            {
                chkTIS.IsEnabled = true;
            }
        }