I have a combobox which has a BindingField that updates when a corresponding grid row is selected.  The combobox is really a dropdown (non-editable), and displays a queried list depending on other selections.  If no selection is made from the dropdown I want a blank to show.  This works okay until I select one that has a value showing in the dropdown.  After this, every blank value shows as the previous record's value instead of blank.  I think the issue is that when the record changes, and the new record has a blank field it is looking for a blank in that dropdown, but doesn't find it so it just stays on the current field.  I may be confusing the point here, but if you understand my question a solution to this problem would be great.  Thanks!

Oh, and RateCode is an nvarchar of length 1 and the blank values are actually empty strings("") and not NULL values.  Rule1Code, Rule2Code, etc. are set up the same way in the other table which the BO is mapped to.

I will have to setup this scenario and test it.  I will let you know when I know something.