unit Unit1;    interface    uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;    type
  TForm1 = class(TForm)
    Memo1 : TMemo;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
   procedure WndProc(var Message: TMessage);override;
  end;    var
  Form1: TForm1;    implementation    {$R *.dfm}
procedure TForm1.WndProc(var Message: TMessage);
begin
  case Message.Msg of
    WM_CREATE : ShowMessage('WM_CREATE');
    
    WM_ACTIVATE :
    begin
      memo1.Lines.Add('WM_ACTIVATE');
      memo1.Lines.Add('fActive  : '   IntToStr(LOWORD(Message.WParam)));
      memo1.Lines.Add('fMinimized :'   IntToStr(HIWORD(Message.WParam)));
      memo1.Lines.Add('hwndPrevious :' IntToStr(Message.LParam));      
    end;
    
  end;      inherited WndProc(Message);
end;    procedure TForm1.Button1Click(Sender: TObject);
var
  Form2: TForm1;
begin
  try
    Form2:= TForm1.Create(self);
    Form2.ShowModal;
  finally
    FreeAndNil(Form2);
  end;
end;    end.