fpSpread1.AllowColumnMove = true;
fpSpread1.ActiveSheet.GroupBarInfo.Visible = true;
fpSpread1.ActiveSheet.AllowGroup = true;
FarPoint.Win.Spread.GroupInfo gi = new FarPoint.Win.Spread.GroupInfo();
gi.BackColor = Color.Yellow;
FarPoint.Win.Spread.GroupInfo gi2 = new FarPoint.Win.Spread.GroupInfo();
gi2.BackColor = Color.Green;
FarPoint.Win.Spread.GroupInfo gi3 = new FarPoint.Win.Spread.GroupInfo();
gi3.BackColor = Color.Orange;
FarPoint.Win.Spread.GroupInfoCollection gic = new FarPoint.Win.Spread.GroupInfoCollection();
gic.AddRange(new FarPoint.Win.Spread.GroupInfo[] { gi, gi2 });
gic.Insert(0, gi3);
fpSpread1.ActiveSheet.GroupInfos.Add(gic[0]);