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WPF ошибка "Нельзя создать неизвестный тип ...ToggleSwitch"

Add-Type -AssemblyName PresentationCore,PresentationFramework,WindowsBase,system.windows.forms
[xml]$xaml = @"
<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Name="Window" WindowStyle="None" 
    Width= "400" Height="100"
    Background="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}"
    AllowsTransparency="True">
    <Window.Clip>
        <RectangleGeometry Rect="0,0,400,100" RadiusX="20" RadiusY="20"/>
    </Window.Clip>
    <Grid x:Name="Grid">
        <Button x:Name="button1" 
           Content="Close" 
           HorizontalAlignment="Left"
           VerticalAlignment="Top" Width="75" 
           Margin="10,10,0,0"
        />
        <ToggleSwitch x:Name="imageToggle"
           Header="Show images"
           OffContent="Show" OnContent="Hide"
           Toggled="ToggleSwitch_Toggled"
        />
    </Grid>
</Window>
"@
$reader = (New-Object System.Xml.XmlNodeReader $xaml)
$window = [Windows.Markup.XamlReader]::Load($reader)
$button1 = $window.FindName("button1")
$button1.Add_Click({
   $window.Close();
})
$window.ShowDialog()|out-null

Всём добра, помогите разобраться с тумблерами (Toggleswich)