[NTG-context] Left border of a rectangle (Metafun)

Hi, I want to draw the left border of the rectangle, but it is drawn in the middle. Why ? Thank you, Fabrice \setupcolors[state=start] \definecolor[MyColorA][c=0.3, m=0.00, y=0.00, k=0.05] \defineoverlay [Funny] [\useMPgraphic{Funny}] \startuseMPgraphic{Funny} interim linecap := butt ; path p ; p := unitsquare xyscaled (OverlayWidth,OverlayHeight) ; drawoptions (withpen pencircle scaled 6.5pt withcolor \MPcolor{MyColorA}) ; draw ulcorner p--llcorner p ; \stopuseMPgraphic \defineframedtext [Methode] [before={\blank}, after={\blank}, frame=off, background=Funny, width=\textwidth, height=fit] \starttext \startMethode \input knuth \stopMethode \stoptext