[NTG-context] MetaFun and different body font size

Dear folks, I'm wondering how to communicate a different default bodyfont size to MetaFun ... consider this: --- \setupbodyfont[32pt] \starttext \input ward \startuseMPgraphic{test} draw unitsquare scaled BodyFontSize; draw textext.rt("Test"); draw btex \TeX etex xshifted 2*BodyFontSize; \stopuseMPgraphic \useMPgraphic{test} \stoptext --- Somehow MetaFun doesn't recognize the larger body font size :-( What can I do? Oliver