This property is available at run time only.
FarPoint.Win.Spread.Row r;
r = fpSpread1.ActiveSheet.Rows[0, 3];
listBox1.Items.AddRange(new Object[] {r.Index.ToString(), r.Index2.ToString()});
Dim r As FarPoint.Win.Spread.Row r = FpSpread1.ActiveSheet.Rows(0, 3) ListBox1.Items.AddRange(New Object() {r.Index.ToString(), r.Index2.ToString()})