Public Overridable Function IndexOf( _
   ByVal value As GroupInfo _
) As Integer

Dim instance As GroupInfoCollection
Dim value As GroupInfo
Dim value As Integer
 
value = instance.IndexOf(value)

public virtual int IndexOf( 
   GroupInfo value
)

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();
gic.AddRange(new FarPoint.Win.Spread.GroupInfo[] {gi, gi2});

fpSpread1.ActiveSheet.GroupInfos.Add(gic[0]);

if (gic.Contains(gi)) {
    int i;
    gic.IndexOf(gi);
    gic.RemoveAt(i);
}

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

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

If gic.Contains(gi) Then
      Dim i As Integer
      gic.IndexOf(gi)
      gic.RemoveAt(i)
End If