Can you please try to access the collection just after the InitializeComponent() method of your application. You should be able to access and clear that collection in order to disable the keyboard support.
Basically you can use the following code:
Please give this approach a try and let us know if you need any further assistance.
Pavel R. Pavlov
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for SILVERLIGHT.
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