FarPoint.Web.Spread.StyleInfo si = new FarPoint.Web.Spread.StyleInfo();
si.BackColor = Color.Yellow;
FarPoint.Web.Spread.NamedStyle nstyleheaders = new FarPoint.Web.Spread.NamedStyle("StyleHeaders", "HeaderDefault", si);
object o;
nstyleheaders.Font.Bold = true;
nstyleheaders.Font.Size = new FontUnit(FontSize.Large);
o = nstyleheaders.Clone();
FpSpread1.NamedStyles.Add(nstyleheaders);
FpSpread1.ActiveSheetView.ColumnHeader.DefaultStyle = nstyleheaders;
FpSpread1.ActiveSheetView.RowHeader.DefaultStyle = (FarPoint.Web.Spread.StyleInfo)o;