DataGridView with combox setting index

I have not written very many windows forms applications, I would think this should be easy.

I want two comboxes in a DataGridView, while loading data from stored procedure I want to set the index of the comboxes from the data coming from stored procedures.

How do I load the comboxes and use the data to populate the DataGridView and set the indexes of the comboxes.

Currently I am using and DataTable populated from stored procedure.

Thanks for all help.