"Decryption Mode" setting is disabled.

["Cathy ." <kyeongyeon.song () gmail com>]

Hi, all.
I'm trying to capture 802.11 packets with AirPcap Nx,
But I can't change the setting especially decryption mode, because they are
disabled.
Icons for 'FCS Filter", "Decryption Mode", "Wireless Settings..",
"Decryption Keys..." are all disabled.
Could someone tell me why is this unavailable and what should I do to enable
this?

My Wireshark version: 1.2.5(SVN Rev 31296)

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