Anybody have experience with writing extensions for BBWin?

Specifically, I need to create three-tier configuration like:

<extension> <foo param="param1"> <bar baz="baz1" /> <bar baz="baz2" /> <bar baz="baz3" /> </foo> <foo param="param2"> <bar baz="baz4" /> <bar baz="baz5" /> </foo> </extension>

I can get to the foo's but not the bar's.

It seems that GetConfigurationRange only seems to want to work one deep from the <extension> level... but there's a HIGH possibility that I'm doing something wrong. :-)

Thanks, Jon