Hi Ed,
If your intension is to have autocomplete fuctionality in GridListControl dropdown, This can be achieved by setting the DropDownStyle to AutoComplete.
this.gridControl1[2, 2].CellType = GridCellTypeName.GridListControl;
this.gridControl1[2, 2].DropDownStyle = GridDropDownStyle.AutoComplete;
this.gridControl1[2, 2].DataSource = GetTable();
this.gridControl1[2, 2].DisplayMember = "Description";
this.gridControl1[2, 2].ValueMember = "Description";
Sample:
http://www.syncfusion.com/support/user/uploads/GridControlDropDown_aaeeea46.zipPlease try this and let me know if ths helps.
Regards,
Jisha