We are using Telerik Rad Controls in SharePoint Visual Webpart.
Any telerik controls either it could be a radbutton or radtabs . After the First Load of the page, when clicked on button or tab the page will post back and the ajax is not working.
However after the postback, ajax seems to start working. Its consistent across all the control where there is a postback event.
How to solve this issue ? As simple sample to solve this issue in SharePoint 2013 will help.