Thanks, Cetin. With your help, I got it to work using:

* frmGridTest.grdInqPost.BeforeRowColChange
LPARAMETERS nColIndex
LOCAL CtrlName
WITH THIS
	IF NOT EMPTY(.Columns(nColIndex).DynamicCurrentControl)
		CtrlName = EVALUATE( .Columns(nColIndex).DynamicCurrentControl )
	ELSE
		CtrlName = .Columns(nColIndex).CurrentControl
	ENDIF
	IF EVALUATE(".Columns(nColIndex)." + m.CtrlName + ".Value") ;
			!= OLDVAL( .Columns(nColIndex).ControlSource )
		WITH THISFORM
			.cmdSave.Enabled = .T.
			.cmdClose.Cancel = .F.
			.cmdCancel.Enabled = .T.
			.cmdCancel.Cancel = .T.
		ENDWITH
	ENDIF
ENDWITH

Seems like, if I only have one control in each column, I could skip the part which checks whether to use DynamicCurrentControl or just CurrentControl. I'll play around with that and see what I can get to work. I think my problem with original code is just that I should have used EVAL(.Columns(nColIndex).CurrentControl + ".Value") on the left side of my comparison. I was leaving out the EVAL().

Thanks again,