[NTG-context] no stretch for footnotes!

Hi, I just noticed that in my MkII footnote definition ... \def\setnotebodyfont {\let\setnotebodyfont\relax \restoreglobalbodyfont\switchtobodyfont[rm,9pt] \setupinterlinespace[stretch=0.05,line=9.8pt,height=.79,depth=. 21]\setupalign[block,hanging,hz]\parskip2pt} ... all works fine, only "stretch=..." does never ever have any effect. Is there an other way to assign numeric stretching to footnotes? Thanks, Steffen