Available for Button objects.
Read/Write at design time
Read only at run time
Specifies whether a Button object is the cancel button or not. It can be one of the following values:
TRUE Button object
is the cancel button.
FALSE Button object is not the
cancel button (default).
Only a Button object inside each window can be the cancel button.
REMARKS: When a Button object is the cancel button,
pressing the <Esc> key has the same effect than clicking on it.