Hello Des,
We will try to create a basic example that uses telerik themes loaded on demand using MEF but currently we have no available resources so it will take some time. I am really sorry for the inconvenience. In general you could check how the themes are loaded in the code of the QSF (the demo site) - that is if you have an account and access to it and see how the themes are loaded there.
Best wishes,
Pana
the Telerik team
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