Switching on/off instrument staff

[Víctor]

Hello Lilyponders:

Is there a way to place a switch in some instrument part so it is not 
rendered when such switch is off? Something like:

\score{
    <<
        \new Staff \with { instrumentName = "Violin" }{
            \relative c'' { c4 d e f }
        }
        \new Staff \with { instrumentName = "Cello" }{
            \relative c { c4 d e f }
        }
    >>
}

\layout{
    \disableCello
}

Thanks,
Víctor.