Works under XP, not work under Vista

[GodlessSinner]

Why running this example under Vista I see a window border(where shows png's) & how to fix?

#include <GDIPlus.au3>

#include <WinAPI.au3>

#include <WindowsConstants.au3>

#include <GuiConstantsEx.au3>

Opt("MustDeclareVars", 1)

; ====================================================================================================

===========================

; Description ...: Shows how to create an alpha blended form

; Author ........: Paul Campbell (PaulIA)

; Notes .........: The images used for this demo MUST be 32 bpp with alpha channel

; Credits .......: Thanks to lod3n for supplying links to the technical documentation that was necessary to build this demo

; ====================================================================================================

===========================

; ====================================================================================================

===========================

; Global constants

; ====================================================================================================

===========================

Global Const $AC_SRC_ALPHA = 1

; ====================================================================================================

===========================

; Global variables

; ====================================================================================================

===========================

Global $hGUI1, $hGUI2, $iLabel1, $iLabel2, $iSlider, $hImage

; Create GUI

$hGUI1 = GUICreate("Alpha Blend", 400, 100)

$iLabel1 = GUICtrlCreateLabel ("Adjust slider to change opacity level: (0-255)", 84, 10, 380, 20)

$iSlider = GUICtrlCreateSlider(10, 32, 380, 40)

$iLabel2 = GUICtrlCreateLabel ("Drag the layered window around your desktop" , 80, 74, 380, 20)

GUICtrlSetLimit($iSlider, 255, 0)

GUICtrlSetData ($iSlider, 255)

GUISetState()

; Create layered child window

$hGUI2 = GUICreate("Test", 250, 250, -1, -1, -1, $WS_EX_LAYERED, $hGUI1)

; Load layered image

_GDIPlus_Startup()

$hImage = _GDIPlus_ImageLoadFromFile(@ScriptDir & "\Images\Button.png")

;~ $hImage = _GDIPlus_ImageLoadFromFile(@ScriptDir & "\Images\Torus.png")

SetBitMap($hGUI2, $hImage, 255)

GUISetState()

; Register notification messages

GUIRegisterMsg($WM_HSCROLL , "WM_HSCROLL" )

GUIRegisterMsg($WM_NCHITTEST, "WM_NCHITTEST")

; Loop until user exits

do

until GUIGetMsg() =$GUI_EVENT_CLOSE

; Release resources

_GDIPlus_ImageDispose($hImage)

_GDIPlus_Shutdown()

; ====================================================================================================

===========================

; Handle the WM_HSCROLL notificaton so that we can change the opacity in real time

; ====================================================================================================

===========================

Func WM_HSCROLL($hWnd, $iMsg, $iwParam, $ilParam)

SetBitMap($hGUI2, $hImage, GUICtrlRead($iSlider))

EndFunc

; ====================================================================================================

===========================

; Handle the WM_NCHITTEST for the layered window so it can be dragged by clicking anywhere on the image.

; ====================================================================================================

===========================

Func WM_NCHITTEST($hWnd, $iMsg, $iwParam, $ilParam)

if ($hWnd = $hGUI2) and ($iMsg = $WM_NCHITTEST) then Return $HTCAPTION

EndFunc

; ====================================================================================================

===========================

; SetBitMap

; ====================================================================================================

===========================

Func SetBitmap($hGUI, $hImage, $iOpacity)

Local $hScrDC, $hMemDC, $hBitmap, $hOld, $pSize, $tSize, $pSource, $tSource, $pBlend, $tBlend

$hScrDC = _WinAPI_GetDC(0)

$hMemDC = _WinAPI_CreateCompatibleDC($hScrDC)

$hBitmap = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage)

$hOld = _WinAPI_SelectObject($hMemDC, $hBitmap)

$tSize = DllStructCreate($tagSIZE)

$pSize = DllStructGetPtr($tSize )

DllStructSetData($tSize, "X", _GDIPlus_ImageGetWidth ($hImage))

DllStructSetData($tSize, "Y", _GDIPlus_ImageGetHeight($hImage))

$tSource = DllStructCreate($tagPOINT)

$pSource = DllStructGetPtr($tSource)

$tBlend = DllStructCreate($tagBLENDFUNCTION)

$pBlend = DllStructGetPtr($tBlend)

DllStructSetData($tBlend, "Alpha" , $iOpacity )

DllStructSetData($tBlend, "Format", $AC_SRC_ALPHA)

_WinAPI_UpdateLayeredWindow($hGUI, $hScrDC, 0, $pSize, $hMemDC, $pSource, 0, $pBlend, $ULW_ALPHA)

_WinAPI_ReleaseDC (0, $hScrDC)

_WinAPI_SelectObject($hMemDC, $hOld)

_WinAPI_DeleteObject($hBitmap)

_WinAPI_DeleteDC ($hMemDC)

EndFunc

[GodlessSinner]

Maybe need to do something with window styles?