>>After reading the rest of the answers, I feel sufficiently stupid now. Why don't you setup a Dynamic control source? The text box has a when false. Use the value of the underlying data to determine which control source to use.
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>It works in a non-subclassed grid. I'm navigating deeper in the parent class code to figure out why it doesn't work in the instantiated grid.I have a lot of code to see.

You're using VFE. That's right. Hmmm. Sorry can't help you there. We've been using Visual MaxFrame.

Well, good luck.