Thank you for using our services.
We would recommend going with a custom provider as this would ensure the correct format is loaded each time the provider is initialized.
Can you please let us know if you have experienced any problems following the provided sample? if so we'\d be glad to assist yo further in resolving them, please do not hesitate to get back to us.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items