You can set new items in the RadTicker via custom client script. I have attached a sample page, demonstrating the suggested approach. Please use it as a reference to incorporate this feature into your actual project.
All the best,
Slav
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed now