Slava,

>I have replaced the mmDataGrid with the DevExpress mmGridControl in my form. I set the BindingSource to my business object and BindingSourceMember to the datafile.DefaultView. The grid displays my data as it supposed to. Now I am trying to leave just columns that I need. There are no columns shown at the Column Designer since the dataset is not created yet. I manually added just one column, last_name. I set properties: Name – colLastName; Caption - Last Name; Field Name - last_name.
>At run time the grid keeps showing all columns.
>I tried to set the Field Name to datafile.last_name with the same result.
>In the mmDataGrid I set TableStyles - MappingName to datafile, but I don't see this property in the mmGridControl.

I think you're on the right track here...what you're seeing is similar to what you would experience if the MappingName property is empty on an mmDataGrid (which inherits this property from the .NET DataGrid base class). You might want to check the DevExpress docs to see what they're expecting here.

Regards,