https://docs.devexpress.com/WPF/DevExpress.Xpf.Scheduling.AppointmentCRUDEventArgs.Undo
AppointmentCRUDEventArgs.Undo() Method | WPF Controls | DevExpress Documentation
Oct 27, 2020 - Developer documentation for all DevExpress products.
undo methodwpf controlsdevexpressdocumentation