BitBt control looks like on the picture below. It's main goal is to add some behaviour on the form where it is placed. It is usefull for modal forms, on a main form it works like usual button. When the BitBtn control is placed on the modal form and user types Enter or Escape key(depending on the selected BitBtn kind), the modal form is usually closed with proper ModalResult(again, depending on selected BitBtn kind). This happends even if BitBtn is not focused.

BitBtn control(widget)