Try using the e.Record to get the GridRecord in that event.
private void gridGroupingControl1_CurrentRecordContextChange(object sender, CurrentRecordContextChangeEventArgs e)
{
if(e.Action == CurrentRecordAction.EnterRecordComplete && e.Record is GridRecord)
{
GridRecord rec = e.Record as GridRecord;
Console.WriteLine(rec.GetValue("Name"));
}
}