Is the DataSource a flat DataTable, or is it DataTable that has a Relation defined making it an hierarchical datasource?
Here is code that is hit when you click on a CaptionRow in a grouped gridGroupingControl with a flat datasource.
private void gridGroupingControl2_CurrentRecordContextChange(object sender, Syncfusion.Grouping.CurrentRecordContextChangeEventArgs e)
{
if(e.Action == CurrentRecordAction.EnterRecordComplete
&& e.Record != null
&& e.Record is GridCaptionRow)
{
GridCaptionRow rec = e.Record as GridCaptionRow;
Console.WriteLine(rec.ToString());
}
}