Dear Fabrice and Wolfgang,

I tried the following code of yours, but I got “! undefined control sequence” error.
Would you please tell me where I should to correct?

Thank you so much,

Best regards,

Dalyoung

%%%%%%%%%%%%%%%
\setupbodyfont[pagella,11pt]

\setupcolors[state=start]

\defineframedtext
 [MyFrame]
 [before={\blank},
  after={\blank},
  frame=off,
  background=MyFrame,
  %width=\textwidth,
  width=max,
  height=fit,
  style=italic]

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

\startuseMPgraphic{MyFrame}
path b;
picture p;
%p := textext.rt("\white\Définition");
p := textext.rt("\white\framedtextparamemter{Title}");
%p := textext.rt("\white\getvariable{text}{text1}");
p := p shifted (2BodyFontSize,OverlayHeight-ypart center p+.25ExHeight);
b := boundingbox p leftenlarged .5EmWidth rightenlarged .5EmWidth;
fill OverlayBox withcolor lightgray;  %\MPcolor{
fill b withcolor darkred;
draw bottomboundary OverlayBox withpen pencircle scaled 1pt  withcolor
darkred;
draw topboundary OverlayBox withpen pencircle scaled 1pt  withcolor
darkred;
draw p;
setbounds currentpicture to boundingbox currentpicture enlarged 2mm;
\stopuseMPgraphic

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

\starttext

\showframe
\startMyFrame[Title=Hans]
\input knuth
\stopMyFrame

\startMyFrame[Title=Hagen]
\input knuth
\stopMyFrame

\stoptext

…..

tex error       > tex error on line 52 in file /Users/graph/Documents/TeXfiles/test.tex: ! Undefined control sequence

<argument> ... p := textext.rt("\white \framedtextparamemter 
                                                  {Title}"); p := p shifted ...
\meta_process_graphic ...currentMPformat }data {#1
                                                  ;}initializations {\meta_f...
\meta_handle_use_graphic ...a_process_graphic {#3}
                                                  \endgroup 
\meta_use_graphic ...me \??mpgraphic #1\endcsname 
                                                  \empty \meta_end_graphic_g...
<to be read again> 
\else 
\executedefinedoverlay ...e \everyoverlay #2\else 
                                                  \lower \d_framed_target_dp...
...
l.52 \stopMyFrame
               

42     
43     \defineoverlay
44      [MyFrame]
45      [\useMPgraphic{MyFrame}]
46     
47     \starttext
48     
49     \showframe
50     \startMyFrame[Title=Hans]
51     \input knuth
52 >>  \stopMyFrame
53     
54     \startMyFrame[Title=Hagen]
55     \input knuth
56     \stopMyFrame
57     
58     \stoptext