You have to assign an Infragistics.Win.OptionSetEditor instance to the column's Editor property, and also assign an Infragistics.Win.ValueList to the column's ValueList property. Note that since the OptionSetEditor displays all of its associated ValueListItems, if there is a large number of items in the ValueList, the items will take up a huge amount of space, so you should only do this if you have a short list.