You can use RadAjaxManager on your master page and RadAjaxManagerProxies in your content page/user control to define declarative ajax settings for your controls. Examine this online demo:
as well as the resources linked under its Description section for more details.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items.