Powershell Befehl ausführen mit GUI u. Consolen Umleitung zu Textbox?

$objTextBox.Text = $script:x | out-string

Add-Type -Name Window -Namespace Console -MemberDefinition '  
[DllImport("Kernel32.dll")]  
public static extern IntPtr GetConsoleWindow();
 
[DllImport("user32.dll")]  
public static extern bool ShowWindow(IntPtr hWnd, Int32 nCmdShow);
'   
#[void] [Console.Window]::ShowWindow([Console.Window]::GetConsoleWindow(), 0)

write-host "Loading..." -ForegroundColor Red  

$x = @()

[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")  
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")   

$objForm = New-Object System.Windows.Forms.Form 
$objForm.Text = "Data Entry Form"  
$objForm.Size = New-Object System.Drawing.Size(600,200) 
$objForm.StartPosition = "CenterScreen"  

$objForm.AutoSize = $True
$objForm.AutoSizeMode = "GrowAndShrink"  

$objForm.KeyPreview = $True

$objForm.Add_KeyDown({
    if ($_.KeyCode -eq "Enter") {  
        $script:x = $objListbox.SelectedItems
        $objForm.Close()
    }
})

$objForm.Add_KeyDown({if ($_.KeyCode -eq "Escape")   
    {$objForm.Close()}})

$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(75,220)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"  

$OKButton.Add_Click(
   {
       $script:x = $objListbox.SelectedItems
       # Items ausgeben
       $objTextBox.Text = $script:x | out-string
       # Einfachen Text in der Box ergänzen
       $objTextBox.Text += "Blablablablabla"  
       $objTextBox.Text += "Blablablablabla 2"  
       $objTextBox.Text += "Blablablablabla 3"  
       # Ausgabe eines Befehls ausgeben
       $objTextBox.Text += gci | out-string
       # usw.
   })

$objTextBox = New-Object System.Windows.Forms.TextBox 
$objTextBox.Location = New-Object System.Drawing.Size(300,40) 
$objTextBox.Size = New-Object System.Drawing.Size(200,500)
$objTextbox.Multiline = $true
$objForm.Controls.Add($objTextBox)

$objForm.Controls.Add($OKButton)

$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(150,220)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"  
$CancelButton.Add_Click({$objForm.Close()})
$objForm.Controls.Add($CancelButton)

$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(10,20) 
$objLabel.Size = New-Object System.Drawing.Size(280,20) 
$objLabel.Text = "Please make a selection from the list below:"  
$objForm.Controls.Add($objLabel) 

$objListbox = New-Object System.Windows.Forms.Listbox 
$objListbox.Location = New-Object System.Drawing.Size(10,40) 
$objListbox.Size = New-Object System.Drawing.Size(260,20) 

$objListbox.SelectionMode = "MultiExtended"  

$trennstriche = @('----------Test-Eintrag----------','','Test2')  

$objListBox.Items.AddRange(@(
"Item 1"  
"Item 2"  
"Item 3"  
$trennstriche
"Item 4"  
"Item 5"  
$trennstriche
"Item 6"  
$trennstriche[1]
"Item 7"  
$trennstriche
"Item 8"  
$trennstriche[2]
"Item 9"  
))

$objListbox.Height = 170

$objListbox.add_SelectedIndexChanged({
   $objListbox.SelectedIndices | ?{$objListbox.GetSelected($_) -and $objListbox.Items[$_] -in $trennstriche} | %{$objListbox.SetSelected($_,$false)}
})

$objForm.Controls.Add($objListbox) 

$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()