Question ProgressBar avec Timer - Powershell XAML

$inputXML = @"
<Window x:Name="MainWindow2" x:Class="WpfApp2.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:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="700" Width="800" WindowStyle="None" ResizeMode="NoResize" WindowStartupLocation="CenterScreen">
    <Grid Background="#FFB9AFAF">
      <TextBlock x:Name="timerinfo" TextAlignment="Center" FontFamily="Calibri" FontSize="14" HorizontalAlignment="Center" TextWrapping="Wrap" VerticalAlignment="Top" Height="22" Width="632" Margin="0,598,0,0"><Run Text="Close window in :"/></TextBlock>
        
        <ProgressBar x:Name="timerbar" HorizontalAlignment="Center" Height="14" Margin="0,645,0,0" VerticalAlignment="Top" Width="340"/>




    </Grid>

</Window>
"@ 
 
$inputXML = $inputXML -replace 'mc:Ignorable="d"','' -replace "x:N",'N' -replace '^<Win.*', '<Window'
[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
[xml]$XAML = $inputXML
#Read XAML
 
$reader=(New-Object System.Xml.XmlNodeReader $xaml)
try{
    $Form=[Windows.Markup.XamlReader]::Load( $reader )
}
catch{
    Write-Warning "Unable to parse XML, with error: $($Error[0])`n Ensure that there are NO SelectionChanged or TextChanged properties in your textboxes (PowerShell cannot process them)"
    throw
}
 
#===========================================================================
# Load XAML Objects In PowerShell
#===========================================================================
  
$xaml.SelectNodes("//*[@Name]") | %{"trying item $($_.Name)";
    try {Set-Variable -Name "WPF$($_.Name)" -Value $Form.FindName($_.Name) -ErrorAction Stop}
    catch{throw}
    }
 
Function Get-FormVariables{
if ($global:ReadmeDisplay -ne $true){Write-host "If you need to reference this display again, run Get-FormVariables" -ForegroundColor Yellow;$global:ReadmeDisplay=$true}
write-host "Found the following interactable elements from our form" -ForegroundColor Cyan
get-variable WPF*
}
 
Get-FormVariables
 


#===========================================================================
# Shows the form
#===========================================================================
write-host "To show the form, run the following" -ForegroundColor Cyan
$Form.ShowDialog() | out-null