If I have an other window overlap with the TV window, the TV window's titlebar (the top part in "ubuntu-look") gets covered, but the inner part of the TV window is drawn in foreground, hiding the other, active, window. It appears that I can "click through" the TV window (e.g. the other window has a button, i drag it behind the TV window, then guess where the button is, and click it)
I just tried to start the ubuntu updater to get some latest packages. Usually, you click on "apply", then the screen darkens and you get prompted for your admin-password. The TV window stayed non-grayed-out on top of the darkening-effect and on top of the password prompt...