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WDialog:Cancel() Method
Undo changes made, where possible, and dismiss the dialog
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Syntax
<oWnd>:Cancel( [ <nResult> ] )   -->  1

Arguments
<nResult> is an optional numeric result (default IDCANCEL) to
be assigned to the Result property.

Returns
One (1).

Description
This method undoes changes, if possible.  Providing any active
control allows it, this method then invokes the EndDialog()
method, passing it the <nResult> value.

This method is mainly used automatically, e.g. if the user
closes a dialog.

Example