[Qt-creator] Designer: Buddy checkbox disables OK button?

[Stephen Chu]

I was adding rows to a form layout and find that once I checked the 
Buddy checkbox, the OK button became disabled:

http://i.imgur.com/j6cth.png

Is this intended? How do I set the pair to be buddies then?

This is with Creator 2.5.1 built from git pull on OS X 10.7.4.