I have an application, which open popover with NSTextField. The text field is not editable. Behavior for text field is set to Editable. I still can
NSTextField
Editable
Definitely a bug. That bug report is exactly what I was trying to do. Even down to creating the status item and overriding mousdown.
I can confirm that Balazs Toth's answer works. I just wonder if it might get in the way down the road.
Bug. http://openradar.appspot.com/9722231