cannot set option group control source

[pandapark]

I have a form with unbound fields. When the users commits the record to live they can edit the record at any time which sets teh control source in code so the fields are populated. works fine except for option groups.
for example in the table fieldname TrainType may have a value of 2.
When the user edits that record it says

Forms!formname!Frame1000.controlsource = "Traintype"

it doesn't carry the value across though ?

any ideas ?
thanks

 

[fabby1]

Panda

OptionGroups have either a boolean expression either Yes/No or True/False so if I understand it properly when you set TrainType your are trying to set it to a String value "Traintype".