Below is an example, which puts the float on top of the text in the margin.
The option « stack=yes » works fine for the margintext when there is no float, but it does not seems to be an option which puts the figure and margintext in a sort of stack.
Thanks for any advice: Otared K.
\setuppapersize[A4][A4]
\setuplayout[
width=120mm,
leftmargin=25mm,rightmargin=50mm]
\setupmargindata[margintext]
[align=raggedright,
stack=yes,
location=outer,
style={\rm}]
\showframe
\startbuffer[sine]
numeric u ; u = 5mm ;
draw function (1,"x","1.5*sin(x)",0,710/113,.01) scaled u
withcolor transparent(1,.5,darkblue)
withpen pencircle scaled 2pt ;
\stopbuffer
\starttext
This is some text.\margintext{This is a remark in the margin.}
This is some more text.\margintext{This text is also in the margin.}
\startplacefigure[location=outermargin,number=no]
\scale[width=\rightmarginwidth]{\processMPbuffer[sine]}
\stopplacefigure
\stoptext