stem direction for main notes vs. grace notes

[Eric Mrozek]

For my particular application (highland bagpipe notation) I want to 
have all the main notes to be stemDown, and all the grace-notes be 
stemUp.

I am auto-generating lilypond code with a program, and I want to use 
the \stemDown "macro" after setting the key and before I spit out any 
of the notes. Everything works fine when the first note is a main note. 
My problem is that if the first note is a grace-note, then that first 
grace-note group gets the stem down and nothing else does.  It appears 
that when the "grace" construct is closed, the context is closed, and 
the stem direction reverts back to the default.

By the way.... this is inconsistent with the behavior for
   \override Stem #'transparent = ##t
which applies to both main and grace-notes, for all the remaining notes 
in the voice.

My present work-around is to place a  "\once \stemDown " string in 
front of every low note throughout the entire score. Is there a more 
global way that I could do this?

Here is a fragment of my "broken" test case....

voice1=  {
 \key d \major
   \override Stem #'transparent = ##t
% the next line could also be \stemDown
   \override Stem #'direction = #-1
   \grace {    g'16[    d''16    cis''16]  }   d''8.[    e''16]   g'8[  
 a'8]
}

Eric