I had several issues when I converted my classic radcontrols Q3 2008 to asp.net ajax Q1 2012. I had updated as well the framework from .Net 2.0 to .Net 4.0 and using Visual Studio 2010 from VS2k5. Now only button works well with RadAjaxManager. All my asp Dropdown, Checkbox, Radiobutton etc dont fire postback anymore and no longer works with RadAjaxManager. Any reason why this happen? Any workaround?