When using the row styling api, the DataGridRowBackgroundAppearance exposes BorderColor and Thickness properties, however, there isn't a corner radius. expose such property. 

Is it possible to be implemented like you have on TreeView -> https://www.telerik.com/maui-ui/documentation/controls/treeview/load-children-on-demand 

As the TreeDataGrid inherits from DataGrid, the DataGrid does not support items of different type, even if all items in the items-source have a property with the same name. Please provide such support for both controls. 

Please add support for multiple row column headers. As an example of what I'm referring to, see the Telerik UI for Blazor implementation here => Blazor DataGrid Demos - Multi-Column Headers | Telerik UI for Blazor