[NTG-context] Keeping titles together with the following text when grid is on

Dear All, when grid is on, orphan and widows have to be eliminated using additional penalty settings. Whereas it works fine for body text, section titles are still sometimes left at the bottom of the page. It can be reproduced using this example: \setuppapersize[B5] \startsetups[grid][mypenalties] \setdefaultpenalties \setpenalties\widowpenalties{2}{10000} \setpenalties\clubpenalties {2}{10000} \stopsetups %comment the following line to see the difference \setuplayout[grid=yes, setups=mypenalties] \showgrid \starttext \blank[force, 9.5cm] \input tufte \section{Tufte} \input tufte \stoptext Is there any extra option for handling this? Thanks, Jan