Printing is a browser feature and the developer cannot control this, because your code is sandboxed by the browser. You have some more details in your other thread here.
In the future, I would advise posting your questions in the most relevant product forum, because the current one is for the Telerik Platform which is a toolset for building mobile applications, and not for ASP.NET.
Telerik by Progress
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?
Telerik Feedback Portal
and vote to affect the priority of the items