Can't hide field border

[Bill Vlahos]

I have a stack that has field that appears to have a border that I  
can't get rid of. It isn't the actual border (I've turned showBorder  
on and off and the appearance changes but doesn't get rid of what  
looks like a border.

I've dragged a new field onto the card and I can hide the border as  
expected. I've compared the Properties of both fields and I don't see  
anything different.

There must be some setting that is different but I can't tell what it  
is. Any ideas on what to look for?

Bill Vlahos