[NTG-context] Layout: odd, even and newLayout

I first want to use layouts for "odd" and "even" pages and then I want to use a "newLayout" but it does not work: \setuppapersize[A5][A4] \setuppagenumbering[alternative=doublesided, location=inleft] \setuplayout [marking=on, location=middle] \showframe \definelayout [odd][topspace=5cm,backspace=0cm] \definelayout [even][topspace=0cm,backspace=0cm] \definelayout [newLayout] [topspace=2cm,backspace=10cm] \starttext \dorecurse{10}{\input tufte} \page \setuplayout [newLayout] % Now backspace must be 10cm, but it is still 0cm \dorecurse{10}{\input tufte} \page \stoptext Regards Jannis