gistfile1.txt

Add-Type -AssemblyName PresentationFramework
Add-Type -AssemblyName System.Windows.Forms


# WPF GUI Windows
$inputXAML = @"

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:GUI_test"
        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit" x:Class="GUI_test.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>

        <xctk:DateTimePicker HorizontalAlignment="Left" Height="32" Margin="115,122,0,0" VerticalAlignment="Top" Width="282"/>

    </Grid>
</Window>


"@


[xml]$Form = $inputXAML -replace 'mc:Ignorable="d"','' -replace "x:N",'N'  -replace '^<Win.*', '<Window'


$NR=(New-Object System.Xml.XmlNodeReader $Form)
$Win=[Windows.Markup.XamlReader]::Load($NR)

$Win.showdialog()