In order to achieve your goal, try adding the below ajax setting in the Page_Load event handler of the content page. There you can also attach the handler of the RadAjaxManager AjaxRequest event:
sender, EventArgs e)
RadAjaxManager manager = RadAjaxManager.GetCurrent(Page);
sender, Telerik.Web.UI.AjaxRequestEventArgs e)
//handle the manager AjaxRequest event here
Check it out and let me know if it works.
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