Allows you to customize menus and bars when the merging mechanism is invoked.
The Merge event's data class is DevExpress.Xpf.Docking.BarMergeEventArgs.
The Merge event fires when the merging mechanism is invoked. Handle this event to perform additional bars/menus customization. For instance, you can manually merge specific bars by calling the Bar.Merge method. To undo customizations made via the Merge event, handle the DockLayoutManager.UnMerge event.