On reviewing your code I have noticed that you are declaring the grid in a Content page. Using master/content page scenario is a more complex case and have some specifications:
should be in the Master
also have to be in the master page. Please replace the manager in the content page with RadAjaxManagerProxy
as described in this topic:
RadAjax and MasterPage
Furthermore, please note that using RadAjaxPanel
simultaneously with RadAjaxManager
( or implementing multiple wrapped RadAjaxPanels
) is not a supported scenario and we highly recommend to avoid such implementation. Please either use just the manager to update your controls replacing the RadAjaxPanel with a regular asp:Panel, or use the RadAjaxPanel alone to wrap your page.
I hope this will prove helpful.
All the best,
the Telerik team
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