Do not use in conjunction with the SL Toolkit for WP TransitionFrame

[Simon]

There is a known issue with the Telerik Dialog service if the RootFrame type of your application is using the Transition Frame object from the Silverlight Toolkit for Windows Phone.

This causes the Dialogs used by the diagnostics control to appear feint and masked (not very readable)

To resolve this either set the root frame back to a PhoneApplicationPage or replace it with the RadPhoneApplicationFrame
instead.