if you upload a theme assembly and assembly containing control, once you choose some controls, the minifier will extract from the theme assembly only the needed xaml and resources. However please note that with our upcoming SP1 release coming this week, we'll release so called themeless assemblies and all xaml files on a side, so that you can easily, manually get only the xaml you need for the specific theme you want.
Please let us know if you have further questions.
the Telerik team
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