switch display managers from login window

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http://forums.fedoraforum.org – Hi guys I spent the last couple of days trying to figure this out i have installed cinnamon as another display manager to check it out the thing is that there must be a little menu marked with the word 'session' at login where i should select which manager i want. this doesn't show unless I log in as root. how do i do to display this for my regular user? Thanks (HowTos)