>>>>Raphael,
>>>>VFP9:
>>>>Maximum # of characters per macro substituted line 8,192
>>>>
>>>>But if this is an issue, why EditBox outside the grid works?
>>>
>>> What happens if you run the function via a cmdButton to a form value and then assign the controlSource for the grid column to that form value?
>>
>>The same: String is too long to fit, when column gets focus.
>
> hmm, could it be that a grid column won't support more than 255 chars in width for any editBox? How many rows is the editBox? maybe more rows would help.

Did you check the code from my first post :-)
There are 21 rows each of 10 chars length (excl. CR LF).
If I make them 22 (*12 = 264) BOOM :o)