How to examine Rev stacks?

[Jim Lyons]

One or more folks here recommended looking inside the Independent Study
stack in the rev docs for an education in how to write scripts
correctly. I've been trying for a little while to do that (even checked
last month's list archive) but with no luck -- if I open the
revtutorialindep.rev file with no other stacks open, that window comes
up, but all the inspector menu choices are disabled. What's the trick to
peeking at the rev doc stacks?

Thanks,
Jim Lyons