Good evening,
In the code below, I get frames filled in black
​ ​
!
Thank you
Fabrice

\setupbodyfont [palatino,11pt]

\definecolor[MyColorB][c=0.00, m=0.62, y=1.00, k=0.00]
\definecolor[MyColorA][.75(MyColorB,white)]

\defineframedtext
   [MyText]
   [frame=off,
    background=MyFrame,
    width=\textwidth,
    location=right]

\defineoverlay
   [MyFrame]
   [\useMPgraphic{MyFrame}]

\definelabel
   [Définition]
   [headstyle=\bf\smallcaps]


\startuseMPgraphic{MyFrame}
     picture p ;
     p := textext.rt(\MPstring{MyFrame}) ;
     p := p shifted (0,OverlayHeight-ypart center p) ;
     fill OverlayBox leftenlarged .1TextWidth withcolor \MPcolor{MyColor} ;
     fill boundingbox p withcolor \MPcolor{myColor} ;
     draw p withcolor white ;
     setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic


\starttext

\startMyText
     \input knuth
\stopMyText

\startMyText
     \input knuth
\stopMyText

\stoptext