using defadvice to delete other windows when hiding threads

[Derrell.Lipman@UnwiredUniverse.com]

I'm trying to learn how to use defadvice to modify gnus behavior.

When I want to look only at the thread subjects in a group (T H) I always also
want to delete the other windows in the frame so that I see a larger portion
of the thread listing.

I've tried the following, which gives no error when being eval'ed, but also
does nothing at all when I do T H...

(defadvice gnus-summary-hide-all-threads (after activate)
  "Display only one window when hiding all threads"
  (delete-other-windows))

What am I doing wrong here?

Or is this entirely the wrong way to be going about this?  Should I just
define a new function that calls gnus-summary-hide-all-threads and
delete-other-windows, and bind T H to it?  I was hoping to use this as an
excuse to understand defadvice.

Thanks,

Derrell