I did a fresh install of Ubuntu 13.10 and added the Cinnamon Desktop Environment and I noticed that the restart and shutdown buttons are MISSING! Only Suspend and Cancel are there. In Ubuntu 13.04 with the Cinnamon Desktop Environment, everything is there and works! Why are the restart and shutdown buttons showing in 13.04 but not 13.10???
This is the default behavior. To show the shutdown menu for example, change the setting for the respective button:
gsettings set org.gnome.settings-daemon.plugins.power button-power 'interactive'