https://supportcenter.devexpress.com/ticket/details/t696931/fluentdesignform-the-baritemlink-begingroup-property-does-not-work
FluentDesignForm - The BarItemLink.BeginGroup property does not work | DevExpress Support
Dec 4, 2018 - Dear. When a TileItemLink has property BEginGroup = True, the separation line is not drawn (it works only the item is member of submenu) Tha
does not workpropertydevexpresssupport