Hello Dror,
Thank you for contacting us.
Unfortunately we do not have such a property, but what you can do here is subscribe for the DropDownOpened event, and then in it subscribe for the SelectedIndexChanged event and this is how you can access "changing by user" event:
I hope this helps. If you have any other questions, do not hesitate to contact us.
Greetings,
Stefan
the Telerik team
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