[xubuntu] xubuntu 12.04 - change default desktop environment?

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http://ubuntuforums.org – Running Xubuntu 12.04 32-bit. for T's and G's, I recently tried out the "xfce session" as opposed to the default "xubuntu session," chosen from login screen. However, now I can't change the default back to "xubuntu session"! Someone please help this is a serious first world struggle! I tried editing .dmrc in $HOME, but that didn't do anything. And even when I open a session using "xubuntu session," after reboot it's back to defaulting to "xfce session." Thanks for you rhelp! (Hardware)