Fehlermeldung bei Datenbank Erstellung

[Hansi]

Hallo,

Könnt Ihr mir bei folgender Feherlmeldung helfen?

[Fehler] Unit1.pas(20): Ungenügende Forward- oder External-Deklaration: 'TForm1.CalcField'

hier der Code dazu.

Delphi-Quellcode:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DBCtrls, Grids, DBGrids, ExtCtrls, TeeProcs, TeEngine,
  Chart, DbChart, DB, DBTables;

type
  TForm1 = class(TForm)
    DBChart1: TDBChart;
    DBGrid1: TDBGrid;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);

  private
      procedure CalcField(DataSet: TDataset);
  public
    Tab1  :TTable;
    DS1   :TDataSource;
    Grid1 :TDBGrid;
    CalcFields    :TFloatField;
  end;

var
  Form1: TForm1;

implementation



{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
close;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
 Tab1 := TTable.Create(Self);
  with Tab1 do begin
    AutoCalcFields := True;
    DatabaseName   := 'c:\Aktien\';
    TableName      := 'Aktienchart';
    TableType      := ttParadox;
    OnCalcFields   := CalcField;
    with FieldDefs do begin
      Clear;
      Add('WKN', ftString, 6, false);
      Add('Datum', ftDate, 20, false);
      Add('Kurs', ftFloat, 20, false);
      FieldDefs[0].CreateField(Tab1);
      FieldDefs[1].CreateField(Tab1);
      FieldDefs[2].CreateField(Tab1);
      CalcFields := TFloatField.Create(Tab1);
      with CalcFields do begin
        FieldName  := 'GD1';
        Calculated := True;
        Visible    := True;
        DataSet    := Tab1;
        Name       := 'Gleitender Durchschnitt1';
        Tab1.FieldDefs.Add(Name, ftFloat, 0, false);
      end;
    end;
    Tab1.CreateTable;
  end;
end;

end.

Was will er?