[NTG-context] \part centered vertically.

Hi guys, I have setup my parts in the following way: \def\MyPart#1#2 {\hbox to \hsize \bgroup \hfill \setupframed[height=.7cm,offset=.5em,frame=off] \framed[align=left]{#1}% \framed[align=right,leftframe=on]{#2}% \egroup} \setuphead[part][before={\vfill},after={\vfill},command=\MyPart] But this does not make my parts titles appear vertically centered. Any one has a clue about it ? How can i get rid of the keyword part or change it when it appears in my title ? Thanx. Dirar.