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Код:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    Label1: TLabel;
    Label2: TLabel;
    procedure TreeView1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.TreeView1Click(Sender: TObject);
begin
  if TreeView1.Selected.Parent<>nil then
  begin
    Label1.Caption:=TreeView1.Selected.Parent.Text;
    Label2.Caption:=TreeView1.Selected.Text;
  end else
  begin
    Label1.Caption:=TreeView1.Selected.Text;
    Label2.Caption:='--';
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  TreeView1.OnClick:=TreeView1Click;
end;

end.