Kevin,
I don't understand what you are suggesting to try. I am already having Orders.DefaultView as a BindingSourceMember for all buttons in the MM .NET sample application. I am not talking about my application. I have reinstalled MM.NET, opened MM Northwind Sample application, replaced dvOrdersByEmployeeID with the DefaultView in the CustomerOrdersForm.cs file and run this application. This is all I did. It gives me the error.

Thanks

Slava

>Slava,
>
>>I replaced dvOrdersByEmployeeID with the DefaultView in the CustomerOrdersForm.cs (16 occurences). BindingSource is Orders, BindingSourceMember is Orders.DefaultView. To make sure that I did not change anything else I reinstalled the MM Framework today. I got the same result.
>
>Hmmm...here's something to try. In the MM .NET sample application can you set the CustomerOrdersForm buttons BindingSourceMember to:
>
>Orders.DefaultView
>
>Let me know if you get an error at run time.
>
>Regards,