Hello Paranoid Andriod,
Yes, you can specify the default behavior of a button in your RadWindow control. You just have to set the attached property RadWindow.ResponseButton that defines what type of action you want it to perform. The ResponseButton property has two enum values, Accept and Cancel. If the user hits the enter keyboard button, the button in your RadWindow which has ResponseButton="Accept" will be clicked. The same goes for the Cancel value, and the ESC keyboard button. We have an article explaining in details how to achieve the behavior here - Use keyboard to get user response with RadWindow
If you have any further questions, please get back to us immediately.
All the best,
the Telerik team
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