An example of where this interface might be implemented is default and cancel button processing. Default buttons are notified when an unprocessed ENTER key is entered for a form, just like a dialog box would be closed. Similarly, cancel buttons are notified whenever an unprocessed ESC key is entered on a form, much like a dialog box would be dismissed. Note to Implementers: Implement this interface in classes that act as button controls. The members of this interface will provide basic button functionality, such as providing a dialogResult to the parent form or the ability to perform a click event, or acting as the default button of a form.