The short answer is that you probably want property context rather than context_bar.
The long answer is that I changed the way context was passed to the
default-master when I removed the per package masters. The way they
are constructed now is it first looks for property context which should be the list of lists as is passed to ad_context_bar (and which the default-master.tcl file uses to set context_bar). If that
is not present and if context_bar is nil then context_bar is set to
[ad_context_bar]. The default-master.adp page then displays context_bar.
