Hi Todd Davis,
This control was removed from the SL toolkit:
http://blogs.msdn.com/silverlight_sdk/archive/2008/06/24/watermarkedtextbox-removed-for-beta-2.aspx
You can use the RadMaskedTextBox and set its EmptyContent and EmptyContentTemplate to achieve the same effect.
Sincerely yours,
Valentin.Stoychev
the Telerik team
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