https://bugzilla.gnome.org/show_bug.cgi?id=651734
Now it is actually just a button, which makes things simpler and is closer to what the designers want.
This is useful in some scenarios.
This is a special-purpose button that can be used together with GPermission objects to control the sensitivity of system settings. Suitable permission objects can e.g. be obtained from PolicyKit. http://bugzilla.gnome.org/show_bug.cgi?id=626457
