[Владимир Максимов]

    switch (SalesFilterComboBox.selection())
    {
    case CRMSalesFilter::All :
        qbrSalesOrder.value(SysQuery::valueUnlimited());
        break;

    case CRMSalesFilter::SalesOrder :
        qbrSalesOrder.value(SysQuery::valueEmptyString());
        break;

    default :
        qbrSalesOrder.value(queryValue(SalesFilterComboBox.selection()));
        break;
    }