>just after a tableupdate(not that I think that that has anything to do with it), I'm trying to reference a custom dropdown called GridCombo1, which is the currentcontrol in Column1 of Grid2 on my form. HOWEVER . . .
>
>THISFORM.Grid2.Column1.GridCombo1.Enabled = .F. gets an "Unknown Member 'Column1'" error.
>
>Is there a rule I don't know about?

In cases like this I would put a breakpoint or SET STEP ON on the line about this one and look for the object in the locals window. You will then see how to reference it.