auto-beam in pickup-bars with grace note

[grisu_76]

As for I get some helpful hints for solving the spacing-problem in
pickup-bars starting with a grace note, now I struggle with the
auto-beaming:

global = {
        \time 6/8
        \key es \major
        \tempo "Presto" 
        \partial 8*3 \grace {s8} 
        \autoBeamOn                 % this doesn't work to get the
auto-beaming back              
        \set beatGrouping = #'(3 3)   %without the two following the result is 
the
same as without...
        \set beatLength = #(ly:make-moment 3 8)
}

ViolineEins = \new Voice {\relative c'{
                \set Staff.midiInstrument = #"violin"

                \partial 8*3 \grace c''8 \p  b8 (a) b-.
                 g-. g-. g-.  \grace{as8} g f g
                \bar "|."
                }}
music = {
        <<
          \tag #'score \tag #' vn1 \new Staff { << \global \ViolineEins >> }
        >>
}

Some ideas? regards, Christian
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