How can you make a layered window clickable?

[WildByDesign]

I'm doing some testing right now with applying WS_EX_LAYERED to a "Scrollbar" window that is being used as a SBS_SIZEBOX / SBS_SIZEGRIP for the GUI.

I am using _WinAPI_SetLayeredWindowAttributes() to remove the background color of the "Scrollbar" window, leaving only the dots. That part is working successfully. But the problem is that it seems using WS_EX_LAYERED makes it so that the "Scrollbar" window is no longer clickable to resize the GUI and makes the hover cursor fail to show directly over it.

If anybody has any ideas for making a layered window clickable, please let me know. This is mostly just for testing and seeing what other possibilities there are for this type of thing. I appreciate your time. Thank you.

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#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>
#include <GuiStatusBar.au3>
#include <StaticConstants.au3>
#include <WinAPIGdi.au3>
#include <WinAPIRes.au3>
#include <WinAPISysWin.au3>
#include <WinAPITheme.au3>
#include <WindowsConstants.au3>

Opt("MustDeclareVars", 1)

Global $g_hGui, $g_hSizebox, $g_hOldProc, $g_hStatus, $g_iHeight, $g_aText, $g_aRatioW, $g_iBkColor, $g_iTextColor, $g_hDots

Example()

;==============================================
Func Example()

    _GDIPlus_Startup()

    Local Const $SBS_SIZEBOX = 0x08, $SBS_SIZEGRIP = 0x10

    $g_hGui = GUICreate("SBS_SIZEBOX / SBS_SIZEGRIP Testing", 400, 200, -1, -1, BitOR($GUI_SS_DEFAULT_GUI, $WS_MAXIMIZEBOX, $WS_SIZEBOX))
    GUISetBkColor(0x202020)

    $g_hSizebox = _WinAPI_CreateWindowEx(0, "Scrollbar", "", $WS_CHILD + $WS_VISIBLE + $SBS_SIZEBOX, 400 - 15, 200 - 15, 15, 15, $g_hGui) ; $SBS_SIZEBOX or $SBS_SIZEGRIP
    ;$g_hSizebox = _WinAPI_CreateWindowEx($WS_EX_TOPMOST, "Scrollbar", "", $WS_CHILD + $WS_VISIBLE + $SBS_SIZEBOX, 300 - 15, 200 - 15, 15, 15, $g_hGui) ; $SBS_SIZEBOX or $SBS_SIZEGRIP

    ; Add WS_EX_LAYERED extended style
    _WinAPI_SetWindowLong($g_hSizebox, $GWL_EXSTYLE, BitOR(_WinAPI_GetWindowLong($g_hSizebox, $GWL_EXSTYLE), $WS_EX_LAYERED))
    _WinAPI_SetWindowPos($g_hSizebox, 0, 0, 0, 0, 0, BitOR($SWP_NOMOVE, $SWP_NOSIZE, $SWP_NOZORDER, $SWP_FRAMECHANGED))
    ;_WinAPI_SetWindowPos($g_hSizebox, $HWND_TOP, 0, 0, 0, 0, BitOR($SWP_NOMOVE, $SWP_NOREDRAW, $SWP_NOSIZE))

    ; Subclass the sizebox (by changing the window procedure associated with the Scrollbar class)
    ;Local $hProc = DllCallbackRegister('ScrollbarProc', 'lresult', 'hwnd;uint;wparam;lparam')
    ;$g_hOldProc = _WinAPI_SetWindowLong($g_hSizebox, $GWL_WNDPROC, DllCallbackGetPtr($hProc))

    _WinAPI_SetWindowTheme($g_hSizebox, "DarkMode_Explorer", "ScrollBar")

    Local $hCursor = _WinAPI_LoadCursor(0, $OCR_SIZENWSE)
    _WinAPI_SetClassLongEx($g_hSizebox, -12, $hCursor) ; $GCL_HCURSOR = -12

    SizeboxResize()
    GUISetState()

    Sleep(2000)

    ; Make surrounding background color around dots transparent
    Local $iColor = 0x383838
    _WinAPI_SetLayeredWindowAttributes($g_hSizebox, $iColor, 255)

    While 1
        Switch GUIGetMsg()
            Case $GUI_EVENT_CLOSE
                ExitLoop

        EndSwitch
    WEnd

    _GDIPlus_BitmapDispose($g_hDots)
    _GUICtrlStatusBar_Destroy($g_hStatus)
    _WinAPI_DestroyCursor($hCursor)
    ; _WinAPI_DeleteObject($g_hBrush)
    ;_WinAPI_SetWindowLong($g_hSizebox, $GWL_WNDPROC, $g_hOldProc)
    ;DllCallbackFree($hProc)
    _GDIPlus_Shutdown()
EndFunc   ;==>Example

Func SizeboxResize()
    Local $aSize = WinGetClientSize($g_hGui)
    WinMove($g_hSizebox, "", $aSize[0] - 15, $aSize[1] - 15)
EndFunc   ;==>SizeboxResize

;==============================================
Func ScrollbarProc($hWnd, $iMsg, $wParam, $lParam) ; Andreik

    If $iMsg = $WM_PAINT Then
        Local $tPAINTSTRUCT
        Local $hDC = _WinAPI_BeginPaint($hWnd, $tPAINTSTRUCT)
        Local $iWidth = DllStructGetData($tPAINTSTRUCT, 'rPaint', 3) - DllStructGetData($tPAINTSTRUCT, 'rPaint', 1)
        Local $iHeight = DllStructGetData($tPAINTSTRUCT, 'rPaint', 4) - DllStructGetData($tPAINTSTRUCT, 'rPaint', 2)
        Local $hGraphics = _GDIPlus_GraphicsCreateFromHDC($hDC)
        _GDIPlus_GraphicsDrawImageRect($hGraphics, $g_hDots, 0, 0, $iWidth, $iHeight)
        _GDIPlus_GraphicsDispose($hGraphics)
        _WinAPI_EndPaint($hWnd, $tPAINTSTRUCT)
        Return 0
    EndIf
    Return _WinAPI_CallWindowProc($g_hOldProc, $hWnd, $iMsg, $wParam, $lParam)
EndFunc   ;==>ScrollbarProc