Disable "show characters" in WIFI network properties?

When the customer open wireless adapter connection --> Properties. In Security Tab he saw a check box " Show characters".
he checked it so Network security key is show
How can I configure the Cisco Controller to prevent the Customer from showing the password characters ?
There is a method to do that on the registry of the widows but the customer doesn't want that ?

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Received on Mon Sep 10 2012 - 19:53:06 ART