Listing Bluetooth devices nearby

Hi all..

I am working on windows phone 8 application. I am trying to list all discoverable bluetooth devices nearby. For that i have used PeerFinder class. Using that class it was able to display the paired bluetooth devices nearby. But I couldn't display unpaired devices. Using PeerFinder.AlternateIdentities["Bluetooth:Paired"] = "" I could read only paird devices. Could anyone please tell me how to get the unpaired bluetooth device information. Waiting for your reply .

thanks,
Aswathy.