You might continue using your logic for setting an application theme for the silverlight toolkit controls but instead of coping/pasting the default styles for the Telerik controls into the toolkit's theme dictionary, you could create a custom theme using the Telerik Approach as described in our documentation here
. Then you can modify some of the resources (brushes, templates, styles) using the toolkit's theme resources and apply the custom theme on the usercontrol
or control level.
Let me know if this will work in your scenario.
All the best,
the Telerik team
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