Borderless window application takes up more space than my screen resolution

I solved the problem this way:

XAML:

WindowStyle="None"
Left="0"
Top="0"
Width="{Binding WPFSettings.Width}"
Height="{Binding WPFSettings.Height}">

Visual Basic:

Public Class WPFSettings
   Public ReadOnly Property Width() As Double
      Get
         Return System.Windows.SystemParameters.PrimaryScreenWidth
      End Get
   End Property

   Public ReadOnly Property Height() As Double
      Get
         Return System.Windows.SystemParameters.PrimaryScreenHeight
      End Get
   End Property
End Class

It works pretty good.

Try this

Width="{Binding Source={x:Static SystemParameters.WorkArea}, Path=Width}"
Height="{Binding Source={x:Static SystemParameters.WorkArea}, Path=Height}"

I found this great solution

<Window WindowStyle="None" WindowStartupLocation="CenterScreen" WindowState="Maximized"
        MaxWidth="{Binding Source={x:Static SystemParameters.WorkArea}, Path=Width}"
        MaxHeight="{Binding Source={x:Static SystemParameters.WorkArea}, Path=Height}"
    >
...
</Window>

But error for me still persists, windows is offset by few pixels on top and left... I tried to set Left and Top to 0 after I change window state but nothing happens.