listform.pas

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unit ListForm;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Buttons, BtnsList;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    SpeedButton1: TSpeedButton;
    ListBox1: TListBox;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    procedure AddToList(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure UpdateList(Sender: TObject);
  private
    List: TButtonList;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.AddToList(Sender: TObject);
begin
  // checks the type
  List.Add (Sender as TButton);
  // no go:
  // List.Add (Sender);
  UpdateList (self);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  List := TButtonList.Create;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  List.Free;
end;

procedure TForm1.UpdateList(Sender: TObject);
var
  I: Integer;
begin
  ListBox1.Items.Clear;
  for I := 0 to List.Count - 1 do
    ListBox1.Items.Add (Format ('%s (%s)',
      [List[I].Caption, List[I].ClassName]));
end;

end.