Connected barlines between Staves ?

[Wim van Dommelen]

Hi,

I'm typesetting a multi-Staff piece, three staves of which the lowest  
two are a PianoStaff and the top one is an individual instrument. Now  
I want to have *all* the barlines vertically connected between all the  
staves, for the PianoStaff this is of course no problem, for the top  
staff I can also accomplished this by grouping everything in a  
StaffGroup, but this gives me the left bracket I don't want nor need.  
See the included .PNG file for the example of what I like to  
accomplish. My feeling is: it is very easy, but I just don't see it.

Can anyone point me in the right direction?

    \score {
      <<
        \new Staff \with {
            instrumentName = #"Cello"
            midiInstrument = #"cello"
        }
        \keepWithTag #'Cello \CelloAndante
        \new PianoStaff \with {
            instrumentName = #"Cembalo"
            midiInstrument = #"harpsichord"
        }
        <<
            \new Staff = "right" {
                \CembaloAndanteRightHand
            }
            \new Staff = "left" {
                \CembaloAndanteLeftHand
            }
        >>
      >>
      \layout {
      }
    }

Regards,
Wim.