Simple grid problem that's driving me nuts. I'm trying to disable a column in my grid if a logical field (users.logyes) is .T. I can't get the enabled property to behave. The error I'm getting is "data type is invalid for this property. Any ideas?

llenabled = 'IIF(users.logyes,.F.,.T.)'
THISFORM.grid1.SETALL("enabled",llenabled,"column")

Thanks,

John.