Xfce on Xubuntu 8.10 how change to be Start-Desktop?

[Heiner Gewiehs]

Hello,

I've installed Xubuntu 8.10 to have Xfce as Desktop-Environment.
No KDE and
no Gnome!

I was happy because Xfce did so until I installed "Nautilus" and with it 
some
Gnome applications.

 From now Xfce starts completely but at once it changes to the 
Gnome-Desktop.

What can I do to start Xfce as First Desktop-Environment without Gnome?

The same Problem on openSUSE 11.1 I could solve by /etc/sysconfig.

At Xubuntu 8.10 I can't find a switch to do so.

Who can help this time?
Thanks, a nice day
Heiner

*********************************************
Heiner Gewiehs * Marketg-Fachkaufm.
info_ät_gewiehs_dot.de
www.buergerliche.org
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