When implemented by a class, returns the number of master-detail relationships for the current master data source.
An integer value that specifies the number of master-detail relationships for the current master data source.
This property returns the number of master-detail relationships for a master data source. If it's set to 0, master-detail mode is disabled.
When implementing a data source for a GridControl, if the RelationCount property is set to a value greater than 0, the grid enables master-detail mode. In this case, each master row displays an expand button, which allows end-users to access the detail data. To hide the expand buttons, set the GridOptionsView.ShowDetailButtons property to false. If you need to disable master-detail mode in a Grid View regardless of the data source's settings, you can use a master View's GridOptionsDetail.EnableMasterViewMode property.