Filter drivers and class co-installers

Hi all,

I tried to use a class co-installer with my storage filter driver, wrote
a proper INF-file and added strings to it just like it’s described in
“Registering Class Co-Installer” DDK article, but when I was installing
my filter driver thru default install context menu item, the filter
driver and co-installer binaries and an accompanying INF-file were
successfully copied into destination folders, all necessary registry
keys and values were created, but the co-installer entry point was not
called. After system reboot I tried to check how my co-installer can add
a property page sheet into the standard storage property page, but then
again I failed to do this. My property page callback routine was called
only twice: first with PSPCB_ADDREF code, and second (right away after
PSPCB_ADDREF) with PSPCB_RELEASE.

But the main question is how can I prepend my filter driver name to,
say, class UpperFilters value while installing my filter driver thru INF
default install section?

Thanks beforehand, any clues and suggestions will be highly appreciated.

With best regards,
Konstantin Manurin