Use Multi-Line.

Put on a panel, you get the lookup (magnifying glass) automatically.

Doesn't seem to work that way on mine. I have the same setup but the udf has the blank box with no magnifying glass when I add it to the panel. There are 17,000 records on the UDT I thought maybe that was the issue, but I've seen lookups on tables with many more records..

In addition to what Kevin said, you have to also make sure your UDF field length and UDT key length are the same. If different, you won't be able to select the UDT as the validation source as seen in Kevin's screenshot.

Hey David. The field lengths match, and I already have the validation working. However, I am still unable to see the magnifying glass for the lookup against these values.

Was the field added to the panel before you linked the UDT to it?

If yes, remove the UDF from the panel and save, then add the UDF to the panel again and save.

I tried this and still no luck =/

Can you paste in a screenshot of your setup and what's you're seeing? That may help people get you an answer faster.

Thanks Sage100User, David Speck, Kevin M. Asking to take a screenshot made me discover my error. I had to recreate this UDF to reduce the primary key size, and while doing so forgot to select the UDT validation on my second go around.