You can use ConTeXt’s \define command where you don’t have to think about \unexpanded etc., e.g.10. August 2015 09:13Dear Hans,
I tested without understanding what \unexpanded, and of course it works !
\define[2]\ChapterCommand
{\setbox\scratchbox\hbox to \leftmarginwidth{#1\hss}%
\hskip-\dimexpr\leftmarginwidth+\leftmargindistance\relax
\framed
[background=titled,frame=off,offset=0pt]
{\box\scratchbox
\hskip\leftmargindistance
#2}}
Wolfgang
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