I'm populating a Infragistics combo box using SF Population methods and it works fine. When I blank out the field I get a error: Conversion from type 'DBNull' to type 'String' is not valid. I have set the 'Nullable' property to 'False' but it doesn't seem to make a difference.  When I use a SF ComboBox it works fine.

Any Ideas on how to resolve this issue? Is this a Infragistics problem?

Thanks

Tim