Raises before this RibbonControl is unmerged and allows you to react to this upcoming change.
[DXCategory("Merge")] public event RibbonMergeEventHandler BeforeUnMerge
<DXCategory("Merge")> Public Event BeforeUnMerge As RibbonMergeEventHandler
The BeforeUnMerge event's data class is DevExpress.XtraBars.Ribbon.RibbonMergeEventArgs.
See the Ribbon Merging article to learn more.