PowerShell crash when calling ShowDialog

ShowDialogCrash.md

Summary

PowerShell crash when calling ShowDialog for the second time. This error occurred when leaving PowerShell console for a long time(10-20 minutes)

http://connect.microsoft.com/PowerShell/feedback/details/691026/trying-to-showdialog-crashes-powershell

Minimal code for reproduce

#Load WPF assembly for Powershell.exe
Add-Type -AssemblyName PresentationFramework

#Create WPF Window object
$xaml = @"
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
    </Grid>
</Window>
"@

#First call(Need to close window manually)
$window = [Windows.Markup.XamlReader]::Parse($xaml)
$window.Topmost = $True  
$window.ShowDialog()

#Wait 20 minutes
sleep (60 * 20) 

#Second call
$window = [Windows.Markup.XamlReader]::Parse($xaml)
$window.Topmost = $True  
$window.ShowDialog() #cause Win32Exception

Workaround

$async = $window.Dispatcher.InvokeAsync({
    $window.ShowDialog() | Out-Null
})
$async.Wait() | Out-Null