HTML5 WebForms Report Viewer Does Work on AJAXified Pages
|Progress® Telerik® Reporting
|Q2 2012 and later
The HTML5 WebForms Report Viewer does not work in an AJAXified page.
To solve this issue, update the viewer in the page by using ite exposed Client-Side API.
Alternatively, make a full post-back to recreate the viewer object.