In the above link, the tabs are added while the page is loading (Page_Load method). I'm trying to add the tabs based on a RadTreeView node value (Node click event). But for unknown reason, I get the following error message:
Error: Sys.WebForms.PageRequestManagerServerErrorException: Script control '' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().
Parameter name: scriptControl