Window frame extension excluding region

[musicstashall 3]

Hey. I'm trying to make a toolbar in the extended window frame area, similar to the windows explorer toolbar. As a toolbar, in the example, a label is used. Is it possible to exclude the region occupied by the label from the area of the extended frame of the window so that the label does not shine through and is in its color? How can this be implemented?

#include <GUIConstantsEx.au3>
#include <MsgBoxConstants.au3>
#include <WinAPIGdi.au3>
#include <WindowsConstants.au3>
#include <WinAPISysWin.au3>

Global Const $GUI_CAPTION = _WinAPI_GetSystemMetrics($SM_CYCAPTION)
Global Const $GUI_BORDER = _WinAPI_GetSystemMetrics($SM_CXDLGFRAME)
Global Const $GUI_SIZEFRAME = _WinAPI_GetSystemMetrics($SM_CXSIZEFRAME)



$hWnd = GUICreate('', 600, 350)
GUISetBkColor(0)
$Lab = GUICtrlCreateLabel("LABEL"&@TAB&"LABEL"&@TAB&"LABEL"&@TAB&"LABEL"&@TAB&"LABEL"&@TAB&"LABEL"&@TAB&"LABEL"&@TAB&"LABEL", 80, 6, 518, 22)
GUICtrlSetBkColor(-1, 0)
GUICtrlSetColor(-1, 0xFFFFFF)

$hRgn = _WinAPI_CreateRectRgnIndirect(_WinAPI_CreateRectEx(80, 6+$GUI_CAPTION, 518, 22))


_WinAPI_DwmExtendFrameIntoClientArea($hWnd, _WinAPI_CreateMargins(2, 2, 31, 2))

GUISetState()
_WinAPI_ValidateRgn($hWnd, $hRgn)
_WinAPI_InvalidateRgn (GUICtrlGetHandle($Lab), 0, True)

;$wRgn = _WinAPI_CreateRectRgnIndirect(_WinAPI_CreateRectEx(0, 0, 600, 350))
;_WinAPI_CombineRgn ($wRgn, $wRgn, $hRgn, $RGN_DIFF)

;_WinAPI_SetWindowRgn($hWnd, $wRgn)

Do

Until GUIGetMsg() = $GUI_EVENT_CLOSE