[NTG-context] Caption next to figure

Hello all, I am trying to convert a document with a lot of small figures in the margin into a more kindle friendly format. In order to do that, I want to have a small figure in the text with an adjacent figure caption. How can I achieve that? I attached an example and a link how it is supposed to look like. \useMPlibrary[dum] \starttext \input tufte \startplacefigure[title={A rectangle with a caption.}] \externalfigure[dummy][width=0.5\textwidth] \stopplacefigure \input knuth \stoptext Andy https://dl.dropbox.com/u/9089117/small_figure_context.png