Hello Joshua,
We've tried to reproduce the problem locally but to no avail. Can you please provide more details on how exactly your setup is built? It will be best if you can open a new support ticket and send us a small sample which contains your UserControl and a page that is using it, where the problem can be reproduced. We will check it and do our best to help.
Kind regards,
Georgi Tunev
the Telerik team