ok - got zoom to work - another question

[David Fawcett]

Joseph,

Does this accurately describe what you are trying to do?

You have a map of California ZipCodes and you have classified them so
that ZipCodes with teachers of interest are colored differently than
ZipCodes where there are no teachers of interest.

Once a user zooms to minimum scale, you want the ZipCode polygons with
teachers of interest to be symbolized with a 'dot' for each teacher.  It
looks like you have successfully set up two complimentary
scale-dependent layers.