KDirModel with Node for top level URL

[Christian Loose]

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Hello everybody,

I'm trying to use KDirModel for the file view in Cervisia. It worked 
pretty well so far but there is one thing I need
and I can't get it to work. I need a tree node for the top level URL 
like "/home/cloose/cvs-src/kde-head/kdepim/kmail"
in the following screenshot: 
http://cervisia.kde.org/images/screenshots/HEAD/mainview.png.

I tried several approaches like subclass or a proxy model but no 
success. Has somebody done this before or does somebody
have an idea how to achieve this?

Thanks for your help!
Christian