Starting with v15.2 ASPxGridListEditor provides built-in support for the master-detail data presentation. To enable it, run the Model Editor for an ASP.NET project, and set the DetailRowMode property of the Views | ListView node to DetailView or DetailViewWithActions.
In DetailViewWithActions mode, a Detail View specified using the DetailRowView property is shown in a detail row. In DetailView mode, the same Detail View is shown, but the toolbar of its nested List View is hidden.
By default, DetailRowMode is None and the master-detail mode is disabled.