lightdm's "Default Xsession"?

[conover@rahul.net (John Conover)]

I use two WM, (xfce and fvwm.) Lightdm's "Default Xsession" is fvwm2.

How do I change lightdm's "Default Xsession" to xfce?

    Thanks,

    John

-- 

John Conover, conover@rahul.net, http://www.johncon.com/