Placing figures flush right and captions in the margin

[Christoph Redecker <christoph.redecker@tu-harburg.de>]

Hi,

I want to place my figures flush right, so that they are aligned with 
the right border of my text area. Captions should be in the right 
margin, flush left, ragged right. It is a one-sided document.

I've tried

\setupfloats[
	location=right]
\setupcaptions[
	location=rightmargin,
	align=flushleft,
	headstyle=\tfx,
	style=\tfx]
\usemodule[tikz]
\starttext
\placefigure{Test figure caption with a pretty long text which might 
eventually require a line break.}{
	\starttikzpicture
		\draw (0,0) rectangle (2,2);
	\stoptikzpicture
}
\stoptext

and the figure is placed left, and no caption is shown. When I remove 
location=rightmargin, the caption is visible. Other settings I've tried:

outermargin - invisible
righthanging - invisible
right - caption is typeset in the gap between text and margin

I found this old thread:
http://archive.contextgarden.net/message/20090707.065101.8175a86c.en.html, 
but it is not very enlightening.

I'm taking the options from http://pmrb.free.fr/contextref.pdf. My 
ConTeXt version is 2011.06.11.

How can I place figures flush right?
How can I place the captions in the right margin?

Regards

Christoph
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