[NumLock]

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls;

type
  TTreeViewData = class(TComponent)
  public
    i: Integer;
    s: String;
  end;

  TForm1 = class(TForm)
    TreeView1: TTreeView;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
  i: Integer;
  o: TTreeViewData;
begin
  for i:=1 to 10 do
  begin
    o:=TTreeViewData.Create(Self);
    o.i:=i;
    o.s:=IntToStr(i*10);
    TreeView1.Items.AddObjectFirst(nil, IntToStr(i), o);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(IntToStr(TTreeViewData(TreeView1.Selected.Data).i)+'*10='+TTreeViewData(TreeView1.Selected.Data).s);
end;

end.