Does anyone know how a hildon application can get notification of when the Nokia 770 is placed in its case (and wifi and bluetooth are turned off)?

Really, all I need to know is when the bluetooth radio is turned off and back on - I thought cover-on notification would be the easiest way.

Both cover-on and inactivity ("screen saver") events cause a "minimize" message to be fired, but the former turns off the bluetooth radio, while the latter does not. I need to do different things in either case. Once I receive the Minimize message, is there a way for me to determine whether or not the bluetooth radio is on? I could then use that to determine whether the minimize event was caused by the cover being put on or by inactivity.