This property is available at run time only.
FarPoint.Win.Spread.Cell acell; acell = fpSpread1.ActiveSheet.Cells[0, 0]; listBox1.Items.Add(acell.Parent.ToString());
Dim acell As FarPoint.Win.Spread.Cell acell = fpSpread1.ActiveSheet.Cells(0, 0) ListBox1.Items.Add(acell.Parent.ToString())