[Qt-interest] QAggregatingProxyModel ?

[Kishore]

Once the dev days presentations mentions a QAggregatingProxyModel class that 
could be part of standard Qt (4.5 release as i recall). Surely, it was not 
included in the release. Sadly, the only reference to the class name returned 
by google is from that presentation 
(http://www.slideshare.net/mariusbu/practical-model-view-programming)

I am now in need of such a class. What are my options?
-- 
Cheers!
Kishore