[NTG-context] Alignment in combination

Hi, how to left align the elements of a combination? \useMPlibrary [dum] \setupexternalfigures [height=2cm] \starttext %% does nothing: \setupcombinations [align=flushleft] \startcombination [2*2] {\externalfigure[dummy][width=2cm]} {} {\externalfigure[dummy][width=2cm]} {} {\externalfigure[dummy][width=4cm]} {} {\externalfigure[dummy][width=3cm]} {} \stopcombination \blank[2cm] %% desired: \startcombination [2*2] {\kern-2cm\externalfigure[dummy][width=2cm]} {} {\kern-1cm\externalfigure[dummy][width=2cm]} {} {\externalfigure[dummy][width=4cm]} {} {\externalfigure[dummy][width=3cm]} {} \stopcombination \stoptext Marco