unit1.~pas

这有很多Delphi应用的例子

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Outline1: TOutline;
    Button1: TButton;
    procedure Outline1Collapse(Sender: TObject; Index: Integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Outline1Collapse(Sender: TObject; Index: Integer);
  Var
    TheStr:String;
begin
  TheStr:=OutLine1.Items[Index].Text;
  MessageDlg(TheStr+'已被折叠',Mtinformation,[mbok],0);
end;

end.