Staff \denies

[Kyle]

Hi:

I'm working on an orchestral score.
I've got all of the notes for each individual part in separate files.
Both the full score and the part score read from these files.
I want CueVoices to show up in the parts but not in the full score.
I thought this would be as easy as having the Staff context of the full score
deny the CueVoice context 
(but accept it, as it does by default, in the part score).

However, this oddly creates a TabStaff (?!?) in place of a CueVoice:

\version "2.19.42"
\include "Cello.ily" %(blah blah ... "\new CueVoice {} \cueDuring {} " ...)
\new Staff {\celloNotes}
\layout {
  \context
  \Staff \denies "CueVoice"
}