_GUICtrlListView_DeleteAllItems() klappt nicht

#include <GuiListView.au3>
#include <GUIConstantsEx.au3>
#include <Process.au3>

Global $windows = "Auto Windowmanager"

$hWnd = GUICreate($windows, 500, 400)

Global $ListView = GUICtrlCreateListView("Fenstername|Datei", 10, 10, 480, 250)
_GUICtrlListView_SetColumnWidth($ListView, 0, 300)
_GUICtrlListView_SetColumnWidth($ListView, 1, 175)

GUISetState(@SW_SHOW)

;_ListWindows()

AdlibRegister("_ListWindows", 1000)

While True
$msg = GUIGetMsg()
Switch $msg
Case -3
Exit
AdlibUnRegister()
EndSwitch
WEnd

Func _ListWindows()
_GUICtrlListView_DeleteAllItems(GUICtrlGetHandle($ListView)); Funzt vielleicht :D!
$windows = WinList()
For $i = 1 To $windows[0][0]
If $windows[$i][0] <> "" And IsVisible($windows[$i][1]) Then
_GUICtrlListView_AddItem($ListView, $windows[$i][0], _GUICtrlListView_GetItemCount($ListView))
$P = WinGetProcess($windows[$i][1])
$Prozess = _ProcessGetName($P)
_GUICtrlListView_AddSubItem($ListView, _GUICtrlListView_GetItemCount($ListView) - 1, $Prozess, 1)
EndIf
Next
EndFunc ;==>_ListWindows

;==============================
;Aus der Hilfe:
;==============================
Func IsVisible($handle)
If BitAND(WinGetState($handle), 2) Then
Return 1
Else
Return 0
EndIf
EndFunc ;==>IsVisible