fpSpread1.Sheets[0].ShowRowSelector = true;
FarPoint.Win.Spread.SpreadView wrkbk = fpSpread1.GetRootWorkbook();
wrkbk.SetImage(FarPoint.Win.Spread.SpreadView.RowSelectorImageDisabled, Image.FromFile("c:\\2.jpg"));
wrkbk.SetImage(FarPoint.Win.Spread.SpreadView.RowSelectorImage, Image.FromFile("c:\\1.jpg"));
Image indicator;
indicator = wrkbk.GetImage(14);
listBox1.Items.Add(indicator.ToString());