Public Sub AddCustomFunction( _
   ByVal functionInfo As FunctionInfo _
) 

Dim instance As DefaultSheetDataModel
Dim functionInfo As FunctionInfo
 
instance.AddCustomFunction(functionInfo)

public void AddCustomFunction( 
   FunctionInfo functionInfo
)

public class CubeFunctionInfo : FarPoint.CalcEngine.FunctionInfo
    {
      public override string Name { get { return "CUBE"; } }
      public override int MinArgs { get { return 1; } }
      public override int MaxArgs { get { return 1; } }
      public override object Evaluate (object[] args)
      {
        double num = FarPoint.CalcEngine.CalcConvert.ToDouble(args[0]);
        return num * num * num;
      }
    }

FarPoint.Win.Spread.Model.DefaultSheetDataModel dataModel = new FarPoint.Win.Spread.Model.DefaultSheetDataModel(3, 3);
dataModel.AddCustomFunction(new CubeFunctionInfo());
dataModel.SetFormula(1, 1, "CUBE(4)");
fpSpread1.ActiveSheet.Models.Data = dataModel;

Public Class CubeFunctionInfo
   Inherits FarPoint.CalcEngine.FunctionInfo

   Public Overrides ReadOnly Property Name() As String
      Get
         Return "CUBE"
      End Get
   End Property

   Public Overrides ReadOnly Property MinArgs() As Integer
      Get
         Return 1
      End Get
   End Property

   Public Overrides ReadOnly Property MaxArgs() As Integer
      Get
         Return 1
      End Get
   End Property

   Public Overrides Function Evaluate(ByVal args() As Object) As Object
   Dim num As Double = FarPoint.CalcEngine.CalcConvert.ToDouble(args(0))
      Return num * num * num
   End Function

End Class

Dim dataModel As New FarPoint.Win.Spread.Model.DefaultSheetDataModel(5, 5)
dataModel.AddCustomFunction(New CubeFunctionInfo())
dataModel.SetFormula(1, 1, "CUBE(4)")
FpSpread1.ActiveSheet.Models.Data = dataModel