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Telerik RadSpellChecker for Silverlight is available in all 2011 versions of the Telerik UI for Silverlight formerly known as Telerik RadControls for Silverlight. It could spell check various controls and also could be adapted to work with custom controls and custom dictionaries. Of course, in comparison to the new version of the control there might be some differences but everything should work correctly.
Please notice that for the proper operation of the RadSpellChecker, you should add references to Telerik.Windows.Controls, Telerik.Windows.Documents.Proofing and Telerik.Windows.Documents.Proofing.Dictionaries.En-US assemblies.
I hope this helps! Let me know if you have other comments or questions.
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