How to enable power buttons in gdm login screen?

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Issue

How to enable/disable the power off/shutdown/restart buttons on the gdm login screen?

The following command fails to enable power buttons on login screen:

gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory -t bool -s /apps/gdm/simple-greeter/disable_restart_buttons true

Environment

Red Hat Enterprise Linux 7.1
Gnome

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