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[Luckie]

Delphi-Quellcode:

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
    procedure MyNotify(Sender: TOBject);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.MyNotify(Sender: TObject);
begin
  ShowMessage('Oops, I did it again.');
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
begin
  for i := 0 to 99 do
  begin
    Listbox1.Items.Add(IntToStr(i));
    Sleep(10);
    Listbox1.Refresh;
    if i = 59 then
    begin
      MyNotify(Listbox1);
      break;
    end;
  end;
end;

Ist eiegntlich kein richtiger Eventhandler, aber es sollte reichen um zu verdeutlichen, was ich meine.