[NTG-context] centering a makeup

Dear list, I have the following sample: \definemakeup [custom] [location=middle, width=.5\textwidth] \starttext \startmakeup [custom] \input ward \stopmakeup \stoptext How can I center the makeup in the page? \definemakeup[custom][align=middle] centers the lines, but this is something different. It is not a question of paragraph orientation. It is rather a question of placing the makeup in the middle of the page (also horizontally) Many thanks for your help, Pablo -- http://www.ousia.tk