troubleshooting Question

Microsoft JScript runtime error :Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.

Avatar of Srinivas_Vengala
Srinivas_VengalaFlag for India asked on
.NET Programming
3 Comments1 Solution6300 ViewsLast Modified:
Hi ,

I am developing a .NET application and testing in IE7.
I have used a Tab Container and built Controls inside each tab panel.
I have also used ModalPopupExtender to show popups.
When I am trying to change tabs and when I close the window, I am getting the following error :
Microsoft JScript runtime error :Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.
Not sure what the problem is ..
Can anyone help in this regards .

Thanks !
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