Well, you see that's what I'd expect to happen, but in real life (that is, using Chrome or IE under Win8.1) the device still remains unaffected after clicking/selecting the "OK" button. Nothing happens, except that the dark overlay screen goes away, and I'm returned to the "Settings" view.
[edit:]
Now I have also verified this behaviour using my wifes MacBook (OSX 10.7) with both the Safari browser (v6.1.6) and Firefox (v31.0). Still the same. My devices just won't go away...