2011/9/4 Wolfgang Schuster <schuster.wolfgang@googlemail.com>
No, it’s a TikZ bug. The macro \@flushglue which is used by TikZ is defined
in the LaTeX kernel but not in ConTeXt and as TikZ is format independent it
has to ensure that the command exists.

Wolfgang

thanks. do you have got a quick fix?

\unprotect
\def\@flushglue?????
\protect