New-AddButtonGUI.ps1

$RawXAML = @"
<Window x:Class="WpfApplication3.MainWindow"
        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:WpfApplication3"
        mc:Ignorable="d"
        Title="MainWindow" Height="344.151" Width="232.521" ResizeMode="NoResize">
    <Grid>
        <StackPanel x:Name="StackButtonsHere" HorizontalAlignment="Left" Height="231" Margin="22,10,0,0" VerticalAlignment="Top" Width="170"/>
        <Button x:Name="AddAButton" Content="The Add-A-Button Button" HorizontalAlignment="Left" Margin="22,277,0,0" VerticalAlignment="Top" Width="170"/>
        <TextBox x:Name="ButtonName" HorizontalAlignment="Left" Height="23" Margin="48,249,0,0" TextWrapping="Wrap" Text="Button Name Here" VerticalAlignment="Top" Width="120"/>
    </Grid>
</Window>
"@       
 
[void][System.Reflection.Assembly]::LoadWithPartialName('PresentationFramework')
[xml]$XAML = $RawXAML -replace 'mc:Ignorable="d"','' -replace "x:N",'N'  -replace '^<Win.*', '<Window'

#Read XAML 
$XAMLReader= New-Object System.Xml.XmlNodeReader $XAML
try{
    $Form=[Windows.Markup.XamlReader]::Load($XAMLReader)
} catch {
    Throw "Unable to load Windows.Markup.XamlReader. Double-check syntax and ensure .net is installed."
}
 
#===========================================================================
# Load XAML Objects In PowerShell
#===========================================================================
 
$XAML.SelectNodes("//*[@Name]") |
ForEach-Object {
    Set-Variable -Name "WPF$($_.Name)" -Value $Form.FindName($_.Name)
}

#===========================================================================
# Events
#===========================================================================

$WPFAddAButton.Add_Click({
    $NewButton = New-Object System.Windows.Controls.Button
    $NewButton.Name = $WPFButtonName.Text
    $NewButton.Content = $WPFButtonName.Text
    $NewButton.Height = 20
    $WPFStackButtonsHere.AddChild($NewButton)

    # Get the button you just added
    $AddedButton = ($WPFStackButtonsHere.Children | 
    Where-Object {
        $_.Name -eq $WPFButtonName.Text
    })

    # Add Click Event
    $AddedButton.Add_Click({
        [System.Object]$Sender = $args[0]
        $WPFButtonName.Text = $Sender.Name
    })
})
#===========================================================================
# Shows the form
#===========================================================================
$Form.ShowDialog() | Out-Null