Someone

program Uinndow;

uses
  Wintypes, messages;

var
button1,label1,font1,Handle: hwnd;
Hide: bool = true;

Function processar_mensagens(h:hwnd;m:cardinal;w:wparam;l:lparam):integer; stdcall;
begin
 case m of
  wm_close: postquitmessage(0);
  wm_create: messagebox(handle, 'Oieeeee =P', 'WM_CREATE <-------', 64);
  wm_command: if l = button1 then sendmessage(handle, wm_close, 0, 0);
 end;
  result := DefWindowProc(h, m, w, l);
end;

Procedure blink;
begin
 if hide then begin showwindow(label1, sw_show); hide := false; end else begin showwindow(label1, sw_hide); hide := true; end;
end;

var
 Tag: TagWndClassA;
 Msg: TMSG;

begin
with tag do begin
 style := CS_CLASSDC;
 lpfnWndProc := @processar_mensagens;
 hInstance := hinstance;
 hIcon := loadicon(0, IDI_APPLICATION);
 hCursor := loadcursor(0, IDC_ARROW);
 hbrBackground := 16;
 lpszClassName := 'MyClassName';
end;

registerclass(tag);

Handle := CreateWindow(tag.lpszClassName, 'Janela de exemplo', WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 200, 150, 0, 0, hinstance, nil);
if Handle = INVALID_HANDLE_VALUE then Halt;
Label1 := CreateWindow('static', 'Hmmm, Uma janelinha ;D', WS_CHILD, 8, 8, 180, 17, handle, 0, 0, nil);
Font1 := createfont(16, 6, 0, 0, 0, 1, 0, 0, 0, 3, 0, 3, 0, 'Courrier new');
Sendmessage(label1, wm_setfont, font1, 0);
settimer(handle, 1, 500, @blink);
button1 := createwindow('button', 'Sair', ws_visible or ws_child, 150, 90, 40, 20, handle, 0, 0, nil);
Sendmessage(button1, wm_setfont, font1, 0);
while getmessage(msg, 0, 0, 0) do begin
 translatemessage(msg);
 dispatchmessage(msg);
end;
end.