I'm not sure, sorry. Did you add a reference to the System.Windows.Controls.Theming.Toolkit.dll assembly in your project?
Note: This was written 2 years ago, for Silverlight 3, and the ImplicityStyleManager is now obsolete as of Silverlight 4. I'd no longer recommend using it - instead you should use Silverlight's native support for implicit styles now.
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Chris Anderson
Co-author
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