I have bind a datatable to a dorpdownlist on a cell. If the datatable has two rows with similar values (wich are setted as value member) and you select the second in the list, when the cell losts focus the the first item in the list is selected automatically.
For example you have the items Date and Date 2 in the dropdownlist. You select Date 2 and leave the cell. Date is automatically selected in the dropdownlist.