var style = new GC.Spread.Sheets.Style();
style.backColor = "red";
style.borderLeft =new GC.Spread.Sheets.LineBorder("blue",GC.Spread.Sheets.LineStyle.medium);
style.borderTop = new GC.Spread.Sheets.LineBorder("blue",GC.Spread.Sheets.LineStyle.medium);
style.borderRight = new GC.Spread.Sheets.LineBorder("blue",GC.Spread.Sheets.LineStyle.medium);
style.borderBottom = new GC.Spread.Sheets.LineBorder("blue",GC.Spread.Sheets.LineStyle.medium);
activeSheet.setStyle(1,1,style,GC.Spread.Sheets.SheetArea.viewport);
var cstyle = activeSheet.getStyle(1,1,GC.Spread.Sheets.SheetArea.viewport, true);
alert(cstyle.backColor);