DevExpress Unable to get value of the property 'usercontrol_dxcontrol_event' : object is null or undefined

I am getting "Microsoft JScript runtime error" when running web application that uses DevExpress controls. I have got a user control hierarchy as follows:- Default.aspx | -> Site.Master | -> LoadInvoiceTab | -> LoadInvoiceTabHeader LoadInvoiceTabHeader has got some javascript code to handle client side events for DevExpress controls. script has been added...

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