Hi Arik,
The GridGroupingControl displays data which is provided by the underlying data source. So to add/remove a record to/from specified location in gridgroupingcontrol, you have to work with the underlying datatable. Please refer to the following code snippets.
//To add a new record at a specific index in grid
DataRow dr = dt.NewRow();
dr["SNo"] = "A100";
dr["StudentID"] = "AS100";
dr["Department"] = "CSE";
dr["Year"] = "I";
dr["Location"] = "City";
dt.Rows.InsertAt(dr, 5);
Sample for you reference:
http://files.syncfusion.com/support/Grid.Windows/F89763.zipThank you for using Syncfusion products.
Regards,
Jisha