TCnButton.Cancel Property
Determines whether the button's OnClick event handler executes when the Escape (ESC) key is pressed.
published property Cancel: Boolean read FCancel write SetCancel default False;
Property Value
Type: Boolean
If Cancel is true, the button's OnClick event handler executes when the user presses Esc. Although an application can have more than one Cancel button, the form calls the OnClick event handler only for the first visible button in the tab order.