[NTG-context] bodyfont size in margin?

I would like to have the same font and especially the same size for inmargin texts. Why is the following program not honouring the size setting? % Font in margin text \def\MarkMaster{\inmargin[location=left]{{\switchtobodyfont[sans,8pt]\red MASTER SECTION}}} \starttext \startchapter[title=\MarkMaster test title] \input tufte \MarkMaster \input tufte \blank contextversion=\contextversion \stopchapter \stoptext Hans van der Meer