unit U_outl;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, Grids, Outline, Spin;

type
  TForm1 = class(TForm)
    Outline1: TOutline;
    SpinEdit1: TSpinEdit;
    procedure FormCreate(Sender: TObject);
    procedure SpinEdit1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
const
  NumberOfItems = 4;
var
  l: array[1..NumberOfItems] of integer;

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
var i, indx: integer;
begin
  with outline1 do
  begin
    indx := add(0, 'level 1');
    for i := 1 to NumberOfItems do
    begin
      l[i] := i;
      AddChildObject(indx, 'level 2 item ' + IntToStr(i), @l[i]);
    end;
  end;
  SpinEdit1.MaxValue := NumberOfItems;
  SpinEdit1Change(Sender);
end;

procedure TForm1.SpinEdit1Change(Sender: TObject);
begin
  with outline1 do
    Caption := Items[GetDataItem(@l[SpinEdit1.value])].Text;
end;

end.