Sample for Handling Custom Column in MC.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using CXS.Retail.Extensibility;

using CXS.Retail.Extensibility.Modules.Purchasing;

using CXS.SubSystem.Purchasing;

using DevExpress.XtraVerticalGrid;

using CXS.Retail.ViewModel.Message;

using System.Windows.Forms;

using CXS.Retail.ManagementUIComponents;

using CXS.Platform.UIComponents;

using DevExpress.XtraGrid;

namespace SampleAddOnForCustomColumnInMCScreen

{

    class CustomColumnOnPurchaseOrderDetail:PurchaseOrderViewModuleBase

    {        

       public override void OnAfterAddDetail(object sender, DetailEventArgs<PurchaseOrder, PurchaseOrderDetail> args)

        {           

            List<PurchaseOrderDetail> PODetail = args.ChildList as List<PurchaseOrderDetail>;

            foreach (PurchaseOrderDetail purchaseOrderDetail in PODetail)

            {

                purchaseOrderDetail.UserDefinedFields["U_VendorCatalog"] = "Catalog - " + purchaseOrderDetail.Description;

            }         

            MessageBox.Show("On After Add details");

        }

    }

}