[Элементы GUI] Проблемное контекстное меню

#include <WinAPI.au3>

$TEXT = "Это кнопка. Не веришь? Кликни!" ; <= это текст

$gui = GUICreate("Как бы кнопка")
$lbl = GUICtrlCreateLabel("", 30, 30, 230, 30, 7)
GUISetState()

$g_tRECT = DllStructCreate($tagRect)
$g_tRECT.Left = 0
$g_tRECT.Top = 0
$g_tRECT.Right = 230
$g_tRECT.Bottom = 30

$g_hDC = _WinAPI_GetDC(GUICtrlGetHandle($lbl))
$g_hFont = _WinAPI_CreateFont(16, 0)
_WinAPI_SelectObject($g_hDC, $g_hFont)
_WinAPI_SetBkMode($g_hDC, 1)
_WinAPI_DrawText($g_hDC, $TEXT, $g_tRECT, 37)

Do
  Switch GUIGetMsg()
    Case $lbl
      MsgBox(0, "", "Кнопка нажата", 0, $gui)
    Case -3
      Exit
  EndSwitch
Until 0