DirOutline Demo 

unit DOUnit;

interface

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

type
  TForm1 = class(TForm)
    DirectoryOutline1: TDirectoryOutline;
    Edit1: TEdit;
    FileListBox1: TFileListBox;
    DriveComboBox1: TDriveComboBox;
    procedure Button1Click(Sender: TObject);
    procedure DirectoryOutline1Change(Sender: TObject);
    procedure DriveComboBox1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
begin
 DirectoryOutline1.Drive := 'D';
end;
procedure TForm1.DirectoryOutline1Change(Sender: TObject);
begin
 Edit1.Text := DirectoryOutline1.Directory;
 FileListBox1.Directory := DirectoryOutline1.Directory;
end;
procedure TForm1.DriveComboBox1Change(Sender: TObject);
begin
 DirectoryOutline1.Drive := DriveComboBox1.Drive;
end;
end.