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WProgressDialog:Cancel() Method
Signal that an on-going activity should stop
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Syntax
<oWnd>:Cancel()   -->  1

Arguments
None.

Returns
One (1).

Description
This method can be used to signal that the activity underlying
a progress dialog should stop.  To make use of this method all
you need is a push button with an id set to IDCANCEL.  The
button's title can be anything you like (e.g. "Abort Print").

If you don't want the user to have such a button, don't put
one in your dialog.

This method sets the Cancelled property; it is up to the
underlying activity to monitor that property and decide to
whether/when to stop.

Example
See SOURCE\OO\PBAR.PRG.