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.GroupInfoCollection gic = new FarPoint.Win.Spread.GroupInfoCollection();
System.Collections.ArrayList coll = new System.Collections.ArrayList(3);
coll.AddRange(new Object[] { gi, gi2 });
gic.AddRange(coll);
fpSpread1.ActiveSheet.GroupInfos.Add(gic[1]);