Thank you for writing.
In the RowSourceNeeded
event, you have access to the parent row by the GridViewRowSourceNeededEventArgs.ParentRow
property. The GridViewRowInfo.Parent
allows accessing the desired parent up to the top hierarchy level. Additional information for the load on demand approach is available here: http://docs.telerik.com/devtools/winforms/gridview/hierarchical-grid/load-on-demand-hierarchy
I hope this information helps. Should you have further questions I would be glad to help.
Telerik by Progress