unit Unit1;

interface

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

type
  TTreeNodeEx = class(TTreeNode)
  private
    _Beschreibung: String;
  protected
  public
  published
    property Beschreibung: String read _Beschreibung write _Beschreibung;
  end;
  
  TForm1 = class(TForm)
    Button1: TButton;
    TreeView1: TTreeView;
    StatusBar1: TStatusBar;
    procedure TreeView1Change(Sender: TObject; Node: TTreeNode);
    procedure FormCreate(Sender: TObject);
    procedure TreeView1CreateNodeClass(Sender: TCustomTreeView;
      var NodeClass: TTreeNodeClass);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.TreeView1CreateNodeClass(Sender: TCustomTreeView;
  var NodeClass: TTreeNodeClass);
begin
  NodeClass := TTreeNodeEx;
end;

procedure TForm1.FormCreate(Sender: TObject);
var lvTreeNodeEx: TTreeNodeEx;
begin
  lvTreeNodeEx := Self.TreeView1.Items.AddFirst(nil, 'Test 1') as TTreeNodeEx;
  lvTreeNodeEx.Beschreibung := 'Beschreibung 1';
  lvTreeNodeEx := Self.TreeView1.Items.AddFirst(nil, 'Test 2') as TTreeNodeEx;
  lvTreeNodeEx.Beschreibung := 'Beschreibung 2';
  lvTreeNodeEx := Self.TreeView1.Items.AddFirst(nil, 'Test 3') as TTreeNodeEx;
  lvTreeNodeEx.Beschreibung := 'Beschreibung 3';
  lvTreeNodeEx := Self.TreeView1.Items.AddFirst(nil, 'Test 4') as TTreeNodeEx;
  lvTreeNodeEx.Beschreibung := 'Beschreibung 4';
  lvTreeNodeEx := Self.TreeView1.Items.AddFirst(nil, 'Test 5') as TTreeNodeEx;
  lvTreeNodeEx.Beschreibung := 'Beschreibung 5';
end;

procedure TForm1.TreeView1Change(Sender: TObject; Node: TTreeNode);
begin
  if Self.TreeView1.Selected <> nil
    then StatusBar1.SimpleText := (Self.TreeView1.Selected as TTreeNodeEx).Beschreibung
    else StatusBar1.SimpleText :='';
end;

end.