>>So, if I understand correctly, there is also a Cancel button, which probably also asks 'Do you want to cancel?' and it will only cancel+close the form if the user confirms. Furthermore, because you set the button's Cancel property to True, it will also be triggered if the user presses the ESC key. Quite straightforward. :)
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>No, the Cancel button doesn't ask a question. It also doesn't close a form. It just cancels all the changes that the user made. E.g. the user has to be careful pressing this button (or ESC), because all changes would be lost. But I think it should be a training issue and we don't need an additional question.

Okay, I now get the picture. When looking at my own apps, sometimes an ESC and Cancel button have to be confirmed, especcially when it is large text input, like in MS Word. Other times it immediately closes the form without saving anything, especcially dialogs. In your case the form isn't even closed. It indicates a certain type of data entry where the users think of a confirmation as overdone.