private void cmdAdd_Click(object sender, RoutedEventArgs e)
        {
            MAccountDocPayment pmt = new MAccountDocPayment(new CTable(""));

            pmt.PaymentType  = "1";
            pmt.Direction    = "1";
            pmt.RefundStatus = "1";
            if (IsAr)
            {
                pmt.Category = "1";
            }
            else
            {
                pmt.Category = "2";
            }

            doc.AddAccountDocPayment(pmt);

            calculateAssociateAmount();
            doc.IsModified = true;
        }