Barline through all staves

[Thomas Scharkowski]

Hi,

I have this Score:

  <<
    \new StaffGroup 
    <<
      \scoreAViolinIPart
      \scoreAViolinIIPart
    >>
    \new ChoirStaff
    <<
      \scoreASopranoVoicePart
      \scoreAAltoVoicePart
      \scoreATenorVoicePart
      \scoreABassVoicePart
    >>
    \scoreABassoContinuoPart
  >>
I would like barlines through all staves at some places, but cannot find a 
solution by myself.
Help appreciated!

Thanks,
Thomas