>The only problem now is that the CheckBox seems to be disabled. I had already checked the ReadOnly and Enabled properties of the CheckBox in the Column, in the Grid.; both properties were set to their default values, i.e., ReadOnly=.F. and Enabled = .T.
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>I cannot understand this. The cursor into which the user would enter this information is a writeable cursor, since I used the "Create Cursor" command.
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>With these settings, why can I not write a Check Mark into the CheckBox?

Make sure to set column ControlSource to be "myTable.MyLogicalField" and not just "MyLogicalField". It's weird, but I've seen the same problem (without adding checkbox on the fly) and using alias name solved it.