❔ Changing TextBlock Background property in a static method

public static IntPtr hookProc(int code, IntPtr wParam, IntPtr lParam)
    {
        if (code >= 0)
        {
            int vkCode = Marshal.ReadInt32(lParam);
            if (wParam == (IntPtr)WM_KEYDOWN)
                if (vkCode == 65)
                {
                    A.Background = new SolidColorBrush(Colors.Red);
                }
        }

        return CallNextHookEx(hhook, code, (int)wParam, lParam);
    }