markup fromproperty footer

[Jan-Peter Voigt]

Hello List,

I wish to fill the footer of a book containing several pieces with 
Composer, Title *and* Piece. I do this regularly without the piece-info ...

--snip--
\paper {
  oddFooterMarkup = \markup { \fill-line {
      \concat { \fromproperty #'header:composer ", " \bold 
\fromproperty #'header:title ", " \fromproperty #'header:piece }
      \fromproperty #'page:page-number-string
    }
  }
  evenFooterMarkup = \markup { \fill-line {
      \fromproperty #'page:page-number-string
      \concat { \fromproperty #'header:composer ", " \bold 
\fromproperty #'header:title ", " \fromproperty #'header:piece }
    }
  }
}

\bookpart {
  \header {
    title = "title"
    composer = "composer"
  }
  \score {
    \relative c' {
      c d e f
    }
    \header {
      piece = "first"
    }
  }
  \score {
    \relative c' {
      c d e f
    }
    \header {
      piece = "second"
    }
  }
}
--snip--

In this snippet, the piece will be omitted in the footer. I would like 
to reach the last one on the current page. Is it possible?
If I put all headers only in the score block, nothing is found in the 
footer. If I put it in the bookpart-block, only one piece will run the 
whole book[part].
Is there a \set-statement I could use? Or are the footer/header-blocks 
typeset, when the score-info is not available?

Jan-Peter