frames, hrule, vfill and pagebreaks (was: Vertically stretched split table)

["Joshua Krämer" <joshua.kraemer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Dear list,

at first, I thought the following code (simplified) with frames,
hrules and vfills between them would work to typeset my table.  However,
I have now realized that sometimes a pagebreak occurs before the final
(invisible) hrule, and then there's no vfill at the bottom of the page.
See this example:

\setuplayout [backspace=10mm, width=middle, topspace=10mm,
height=middle, header=0mm, headerdistance=0mm, footer=1mm,
footerdistance=0mm]
\setupframed[frame=on,framecolor=green,location=middle,align=right]
\define [2] \Tabline {

	\hrule
	\page[no]
	\vfill
	\dontleavehmode\framed[width=60mm]{#1}\framed[width=100mm]{#2}
	\vfill
	\hrule height 0pt
	\par\page[bigpreference]
}

\setupbackgrounds[footer][text][topframe=on]

\starttext
\Tabline{\dorecurse{100}{word }}{\dorecurse{150}{word }}
\Tabline{\dorecurse{170}{word }}{\dorecurse{100}{word }}
\stoptext

How can I make sure a pagebreak occurs only between the Tablines?
The Tabline on the 1st page should appear centered, too.  "\page[no]"
before "\hrule height 0pt" has no effect.

Thank you and kind regards
Joshua Krämer


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