Как создать поле Lookup во время выполнения приложения

uses
Forms, Classes, Controls, StdCtrls, Db, DBTables, DBCtrls;

type
TForm1 = class(TForm)
Table1: TTable; // DBDemos customer table
Table2: TTable; // DBDemos orders table
Button1: TButton;
DBLookupComboBox1: TDBLookupComboBox;
DataSource1: TDataSource;
Table2CustNo: TFloatField; // CustNo key field object used for Lookup
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
with TStringField.Create(Table2) do begin
FieldName := ‘MyLookup’;
FieldKind:= fkLookup;
DataSet := Table2;
Name := Dataset.Name + FieldName;
KeyFields:= ‘CustNo’;
LookUpDataset:= Table1;
LookUpKeyFields:= ‘CustNo’;
LookUpResultField:= ‘Company’;
DbLookupCombobox1.DataField:= FieldName;
DataSource1.DataSet:= Dataset;
Table2.FieldDefs.Add(Name, ftString, 20, false);
end;
DbLookupCombobox1.DataSource:= Datasource1;
Table1.Active:= True;
Table2.Active:= True;
end;

end.