Public Overridable Default Property Item( _
   ByVal index As Integer _
) As GroupInfo

Dim instance As GroupInfoCollection
Dim index As Integer
Dim value As GroupInfo
 
instance.Item(index) = value
 
value = instance.Item(index)

public virtual GroupInfo this[ 
   int index
]; {get; set;}

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.Item[0]);

FpSpread1.AllowColumnMove = True
FpSpread1.ActiveSheet.GroupBarInfo.Visible = True
FpSpread1.ActiveSheet.AllowGroup = True

Dim gi As New FarPoint.Win.Spread.GroupInfo
gi.BackColor = Color.Yellow

Dim gi2 As New FarPoint.Win.Spread.GroupInfo
gi2.BackColor = Color.Green

Dim gi3 As New FarPoint.Win.Spread.GroupInfo
gi3.BackColor = Color.Orange

Dim gic As New FarPoint.Win.Spread.GroupInfoCollection()
gic.AddRange(New FarPoint.Win.Spread.GroupInfo() {gi, gi2})
gic.Insert(0, gi3)

FpSpread1.ActiveSheet.GroupInfos.Add(gic.Item(0))