Indeed, you are correct, I misled you in suggesting to work with the CancelEdit command of the data form as you will need a reference to it. What you can try instead is to create custom UserControl, place the button inside and perform the logic for canceling editing of the data form and the source collection inside.
Nevertheless, we will definitely consider improving the behavior and research the possibility for exposing the commands of the data form.
All the best,
the Telerik team
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