Hi JMS,
If you want to dynamically provide values for the GridListControl dropdown so they vary from cell to cell, then you should use the CurrentCellShowingDropDown event, and dynamically set the DataSource to the drop list at that point. There is a KB for doing this for a ComboBox cell.
Here is a KB article that discuss with the simillar issue.
http://www.syncfusion.com/support/kb/grid/Default.aspx?ToDo=view&questId=115&catId=12Also refer the forumthread for more details.
http://www.syncfusion.com/support/forums/message.aspx?&MessageID=53308Best regards,
Haneef