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!

I think maybe I need to explain further and you can tell me if I'm doing this the wrong way.  I have a BusinessObject with fields called Rule1Code, Rule2Code, Rule3Code, etc.  Each of these has a combo box which is populated by a SQL Select from a different table than the BO looks at, and its field is RateCode.  Each of the combo boxes are then bound to the BO and the BindingField set to Rule1Code, Rule2Code, etc.  Could any of this be part of my problem and is there a better way to do this?