VB.NET 2015 datagridview bound to .xsd, trying to change a column to a combobox; no luck

[leo57]

In the properties of "Edit columns" dialog in the "columnType" it allows the choosing of a ComboBox" and then I can choose an .xsd data source however... the "DisplayMember" and "ValueMember" properties are "NONE" and cannot be changed.
So what's the magic potion for making this work?

 

[leo57]

I got one step closer I was not picking the correct item for the datasource.
However I still get an error. I thin it has to do with the column being nvarchar(2) and the data I am trying to look up is 255. I changed that in SQL but I need to refresh the datasource or delete it and start over???