Dear Fabrice, A try and error method which you may not want: % macros=mkvi \setuppapersize[A4][A4] \setupcolors[state=start,cmyk=yes,mpcmyk=yes] \definecolor[mycolor][c=0.45,m=0.00,y=0.1,k=0.00] \definecolor[colortext][c=1,m=0.00,y=0.3,k=0.3] \starttext \startuniqueMPgraphic{funny} path p ; numeric h ; h := OverlayHeight ; p:=unitsquare xscaled \overlaywidth yscaled \overlayheight superellipsed 0.9 ; pickup pencircle scaled \overlaylinewidth ; fill p withcolor \MPcolor{\overlaycolor} ; draw (20,1)--(20,h-1) withcolor red ; draw p withcolor \MPcolor{\overlaylinecolor} ; \stopuniqueMPgraphic \defineoverlay[funny][\uniqueMPgraphic{funny}] \define[2]\MySectionCommand {\framed [background=funny, frame=off, width=0.5\textwidth, align={right}, framecolor=mycolor, rulethickness=1.5pt, backgroundcolor=white, offset=4pt] {\tfb #1\space\colortext#2}} \setuphead[section][command=\MySectionCommand,ownnumber=yes,numbercolor=colortext] \section{A}{PLAN DE L'ESPACE} \stoptext Best, Akira