Hello Igor,
We already deprecated the RadUpload control and therefore we will be no longer updating its documentation.
Considering the event that you are referring to, it seems that teh RadAsyncUpload control does not have this event and it seems to have been used with the RadUpload control. I will make sure that we update the demo accordingly. You can also find your Telerik point updated for the provided feedback.
Regards,
Kate
Telerik
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