Grace notes in multiple voices << {} \\ {} >>

[MusFelix]

\grace, \afterGrace, \appoggiatura and \acciaccatura yield problems when used
in << {...} \\ {...} >> setups.  Among other ways of doing it, I have tried
the following five setups with bad results (errors, colliding columns,
etc.):

     4(  8-.)
    << { \grace fs'8 es8( ds es-.) }
    \\ { gs,4 b8}
    >>
    
     4( \afterGrace  8-.) { fs'8 }
    << { es8( ds es-.) }
    \\ { gs,4 b8}
    >>
    
     4(  8-.)
    << { \acciaccatura fs'8 es8( ds es-.) }
    \\ { gs,4 b8}
    >>
    
     4(  8-.)
    << { \appoggiatura fs'8 es8( ds es-.) }
    \\ { gs,4 b8}
    >>
    
    << { s4.                    \acciaccatura fs'8 es8( ds es-.) }
    \\ { <a, fs'>4(  8-.)     gs4 b8 }
    >>

http://old.nabble.com/file/p31020086/lilypondSnippetPicture.png 

How do I this?  Thanks.
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