It's not working for me when I use a very simple query?

I've downloaded and taken a look at Steve's A2KConditionalFormattingVer27
database.  It works great and I really want to use it.  Based on my testing
it works great against a data table but not a query.  I wonder why?

In his example he is going against a table called customerNoName.  I created
a query called qrycustomerNoName, changed the sample form and everything
worked.

I then tried my query.  Here's my query...
SELECT tblEventDate.EventDateID, tblEventDate.EventDate,
tblEventDate.EventDateName, tblEventDate.EventDateInitials,
tblEventDate.EventDateDescription, tblEventDate.HighInTrial,
tblEventDate.HighCombined, qrySelectLockedInEvent.EventID
FROM qrySelectLockedInEvent INNER JOIN tblEventDate ON
qrySelectLockedInEvent.EventID = tblEventDate.EventID
WHERE (((tblEventDate.EventDate) Is Not Null))
ORDER BY tblEventDate.EventDate;

The form stopped showing the background colors.  The only thing I changed
was the recordsource to this query.  

I'm stumped and wondered if Steve or anyone else can give me some ideas on
what to try to make this work.  I really like the idea and it will add a lot
of value to my application.

Thanks,

Rick