Newbie question: stopping methods buffer from auto-expanding

I'm using ECB on Windows; Emacs 22.1, ECB 2.32.  I have a minor 
annoyance that I can't seem to get rid of.

When I'm doing serious editing on a Python file, I usually like to have 
all classes in the methods buffer collapsed except the one I'm working 
in.  I start with "collapse all completely", which works, but as soon as 
I make a change to the code, even typing a character, the tree expands 
completely (well, except for Imports and Variables).

I've played a bit with the customization items for the buffer with no 
success.  Any hints?

Thanks,
-- 
Don Dwiggins
Advanced Publishing Technology


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