MenuItem - Probleme mit SetOnEvent?

;#NoTrayIcon

Opt("MustDeclareVars",1)
Opt("GUIOnEventMode",1)

Const $GUICLOSE = -3

Const $TITLE = "template"
Const $WIDTH = 400
Const $HEIGHT = 400

main()
Func main()
Local $mItemFile,$mItemClose

GUICreate($TITLE,$WIDTH,$HEIGHT)
GUISetOnEvent($GUICLOSE,"_EXIT")

$mItemFile = GUICtrlCreateMenu("Datei")
$mItemClose = GUICtrlCreateMenuItem("Beenden", $mItemFile)

GUICtrlSetOnEvent($mItemClose, "_EXIT")

GUISetState(@SW_SHOWNORMAL)
While 1
Sleep(1000)
WEnd
EndFunc

Func _EXIT()
Exit
EndFunc

#include <GUIConstants.au3>
#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <IE.au3>
#include <Word.au3>

buildGUI()

Func buildGUI()
; Settings
Opt("GUIOnEventMode", 1)

; Main GUI:
$guiMain = GUICreate("SytemScheine", 634, 479, 256, 223)
$guiLogo = GUICtrlCreatePic("res\ssp.gif", 1, 0, 631, 55)

; Login:
$labelUser = GUICtrlCreateLabel("Benutzer:", 8, 63, 49, 17)
$inputUser = GUICtrlCreateInput("...", 64, 60, 145, 21)
$labelPwd = GUICtrlCreateLabel("Passwort:", 222, 63, 50, 17)
$inputPwd = GUICtrlCreateInput("...", 278, 60, 145, 21, BitOR($ES_PASSWORD, $ES_AUTOHSCROLL))
$buLogin = GUICtrlCreateButton("Login", 438, 58, 48, 25, 0)
$iconLogin = GUICtrlCreateButton("1", 497, 58, 24, 24, $BS_ICON)
GUICtrlSetImage(-1, "res\loggedout.ico")

; Tabs
$tabs = GUICtrlCreateTab(0, 88, 633, 369)
GUICtrlSetResizing(-1, $GUI_DOCKWIDTH + $GUI_DOCKHEIGHT)

; Tab: Neuer Systemschein
$tsNew = GUICtrlCreateTabItem("Systemschein anlegen")
$labelSN = GUICtrlCreateLabel("Seriennummer:", 16, 128, 74, 17)
$inputSN = GUICtrlCreateInput("", 96, 126, 153, 21)
$buCheckSN = GUICtrlCreateButton("Abfragen", 256, 125, 57, 25, 0)

; Tab: Vorhandene Sytemscheine
$tsExisting = GUICtrlCreateTabItem("Vorhandene Systemscheine")

; Abschluss des Tabs
GUICtrlCreateTabItem("")

; Menu:
$mItemFile = GUICtrlCreateMenu("Datei")
$mItemClose = GUICtrlCreateMenuItem("Beenden", $mItemFile)
$mItemDB = GUICtrlCreateMenu("Datenbank")
$mItemBackup = GUICtrlCreateMenuItem("DB Backup", $mItemDB)
$mItemOptions = GUICtrlCreateMenu("Optionen")
$mItemInfos = GUICtrlCreateMenu("Info")
GUISetState(@SW_SHOW)

; Events
;GUICtrlSetOnEvent($buLogin, "login")
GUICtrlSetOnEvent($mItemClose, "_Exit")
GUICtrlSetOnEvent($mItemBackup, "test")
GUISetOnEvent($GUI_EVENT_CLOSE, "_Exit")

While 1
Sleep(100)
WEnd

EndFunc ;==>buildGUI

Func test()
MsgBox(0, "", "12345")
EndFunc

Func _Exit()
MsgBox("", "", "lala")
Exit
EndFunc ;==>_Exit