Call this from your event handler to veto a system shutdown or to signal
to the calling application that a window close did not happen.
You can only veto a shutdown if \helpref{wxCloseEvent::CanVeto}{wxcloseeventcanveto} returns
Call this from your event handler to veto a system shutdown or to signal
to the calling application that a window close did not happen.
You can only veto a shutdown if \helpref{wxCloseEvent::CanVeto}{wxcloseeventcanveto} returns