I wasn't able to tell that the DisplayFormat property of dbgrid did anything at all. Is this documented anywhere?

And apparently, there is no EditFormat I want to do is some rudimentary validation, e.g., make sure a zipcode is exacty five characters long and all characters are digits. How do I do that in a Lazarus/FPC dbgrid?

BTW, Thanks to all for the help on my prior questions. Turns out that PostgreSQL does work better than MySQL in Lazarus. It only took me a couple of hours to get my simple zipcode maintenance editor up and capable of doing entry, delete, and edit. Most of that time was spent figuring out the differences between MySQL and PostgreSQL. I ended up installing PostgreSQL about 5 times -- apparently if you don't just accept all of the defaults for account names, you can't get to anything in the database from Lazarus.