Hello Kevin,
We tried to reproduce the problem on our LoadOnDemand example but without much success - we placed a RadScriptBlock on the ProductsCS.ascx page.
Please find attached our test files. Do they work at your side?
If yes, could you please modify them and send them back to us so that we are able to see the error at our side?
Thank you for your time and cooperation.
Kind regards,
Helen
the Telerik team