Centos 6.3 force password prompt on clicking nm-applet tray icon?

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http://unix.stackexchange.com – I'm using Network Manager to connect to a secure wireless network on a publicly accessible kiosk machine. The problem is, if the user manages to get to the desktop, the nm-applet is accessible by a non-root user. So a user can simply right click on a tray icon, edit connection settings and see the credentials for the wireless network in plain text. What I would like is for the applet to start on login (as a non-root user) and connect to the internet. But when a user clicks the tray icon it prompts for the root password. I haven't used Network Manager in a while but on previous RedHat syst (HowTos)