PowerShell and Single Threaded Apartment

I have developed a small GUI tool in PowerShell using WPK. I have the following start up command ``` powershell -ExecutionPolicy Unrestricted -file PowerTools.ps1 -noexit -sta ``` I am getting the following error. ``` New-Object : Exception calling ".ctor" with "0" argument(s): "The calling thread must be STA, because many UI components require this." At \WindowsPowerShell\Modules\WPK\GeneratedControls\PresentationFramework.ps1:34 10 char:29 + $Object = New-Object <<<< System.Windows.Window + CategoryInfo : InvalidOperation: (:) [New-Object], MethodInvocationException + FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand ``` From my Googling, STA stands up "single-threaded apartment", I noticed that that powershell.exe has the "-sta" flag, but that does not help either. The essence of my ps1 file looks like the following ``` Import-Module WPK function get-gui() { New-Window -WindowStartupLocation CenterScreen ` -Width 1200 -Height 200 -Show { New-Grid -Rows 32, 32, 32, 32 -Columns 110, 200* { ... } } } } get-gui ``` Any hints please? (I did spend quite a bit of time doing my own research)