Loading PDF Object file stops mouse wheel detection

[EKY32]

Hey there,

I'm very thankful.

Mouse wheel detection works correctly untill loading the pdf file into the com object:

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#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>

GUIRegisterMsg($WM_MOUSEWHEEL, "_WM_MOUSEWHEEL")
GUICreate("PDF Object", 802, 590)
$oPDF = ObjCreate("AcroPDF.PDF.1")
$oPDF.src = (@ScriptDir & "\file.pdf") ; loading the pdf file stops mouse wheel detection
$GUI_ActiveX = GUICtrlCreateObj($oPDF, 10, 10, 780, 550)
GUICtrlSetStyle($GUI_ActiveX, $WS_VISIBLE)
GUICtrlSetResizing($GUI_ActiveX, $GUI_DOCKAUTO)
GUISetState()

;~ $oPDF.setShowToolbar(False)
;~ $oPDF.setShowScrollbars(True)
;~ $oPDF.setCurrentPage(10)
;~ $oPDF.gotonextpage()
;~ $oPDF.setZoom (10)

While 1
    $msg = GUIGetMsg()
    Select
        Case $msg = $GUI_EVENT_CLOSE
            ExitLoop
    EndSelect
WEnd
$oPDF = ""
$GUIActiveX = ""
Exit

Func _WM_MOUSEWHEEL($hWnd, $iMsg, $wParam, $lParam)
    Local $iMPos = MouseGetPos()
    Switch $wParam
        Case 0x00780000
            ToolTip("Mouse wheel UP is detected!" & @CRLF & @CRLF & 'Click in the "My GUI" to return...', $iMPos[0], $iMPos[1], "Wheel UP", 1, 3)
        Case 0xFF880000
            ToolTip("Mouse wheel Down is detected!" & @CRLF & @CRLF & 'Click in the "My GUI" to return...', $iMPos[0], $iMPos[1], "Wheel Down", 1, 3)
    EndSwitch
    Return $GUI_RUNDEFMSG
EndFunc   ;==>_WM_MOUSEWHEEL

If there is any way to fix that.

Thank you.