FarPoint.Win.Spread.Model.DefaultSheetStyleModel defstyleModel = new FarPoint.Win.Spread.Model.DefaultSheetStyleModel();
FarPoint.Win.Spread.StyleInfo sInfo = new FarPoint.Win.Spread.StyleInfo();
FarPoint.Win.Spread.StyleInfo composite = new FarPoint.Win.Spread.StyleInfo();
defstyleModel = (FarPoint.Win.Spread.Model.DefaultSheetStyleModel)fpSpread1.ActiveSheet.Models.Style;
sInfo.BackColor = Color.LightBlue;
defstyleModel.SetDirectInfo(0, 0, sInfo);
composite = defstyleModel.GetCompositeInfo(0, 0, 0, sInfo);
listBox1.Items.Add(composite.BackColor.ToString());