Does anyone know how to add options to the 'sort' and 'group by'
selections in the Data View web part? When you enable sort and group
using the Data View Properties, something determines what options to
include (e.g. Title, Status) in the drop-down menu. I would like to add
another column (in this case, Assigned To, which is a person's
username) to those options. Does that have to be done in code? What
determines the columns that SPD chooses to include?