Commented Issue: Sys.Extended is undefined when trying to wire client side events [26751]

Hello. I am trying to use the AsyncFileUpload control from the toolkit. When I don't try to hook any client side events, the control works as expected and uploads without issue. When I try to hook any client side events (, I see this in the javascript error console:

Error: Sys.Extended is undefined

I have a ToolkitScriptManager on the page so I'm not sure what else I should be doing.

Thanks


Comments: They cannot reproduce the issue but the rest of the world can TypeError: Sys.Extended is undefined ...r, {"FilterType":2,"id":"ctl00_cphContent_fteFiscalNumberBankTransfer"}, null, n...