Powershell individueller Rückgabewert von AddClick

#Program definieren
$excel = New-Object -ComObject Excel.Application
#Datei Definieren
$file = 'c:\temp\Datei.xlsx'  
#im hintergrund ausführen
$excel.visible = $true
#Datei öffnen
$workbook = $excel.workbooks.open($file)

$Buttons= @()
$x_pos= 10
$Buttonauswahl="LEER"  

for ($i=2; $i -le $workbook.Worksheets.count(); $i++) 
{
$tabelle = $workbook.Worksheets.Item($i)
$NameLen = ($tabelle.Name.Length)*12

$Button = New-Object System.Windows.Forms.Button
$Button.Size = New-Object System.Drawing.Size($NameLen,20)
$Button.Location = New-Object System.Drawing.Size($x_pos,10)
$Button.Text = $tabelle.Name
$Button.DialogResult = "OK"  

#Button in Array Ablegen
$Buttons += $Button



$x_pos += $NameLen + 5
}

Start-Sleep -Seconds 0.5
$excel.Quit
Start-Sleep -Seconds 0.5
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($excel)


[void] [System.Reflection.Assembly]::LoadWithPartialName(„System.Drawing“)
[void] [System.Reflection.Assembly]::LoadWithPartialName(„System.Windows.Forms“)
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = „Projektauswahl“
$objForm.Size = New-Object System.Drawing.Size($x_pos,300)
$objForm.StartPosition = „CenterScreen“
$objForm.KeyPreview = $True

#Bei ESC Fenster schließen
$objForm.Add_KeyDown({if ($_.KeyCode -eq „Escape“) { $objForm.DialogResult=“Cancel“;$objForm.Close()} })

#Buttons hinzufügen
foreach ($btn in $Buttons){

#Alle Button sollen das Fenster Schließen
$btn.Add_Click({
$Buttonauswahl=$btn.Text;
[void]$objForm.Close()
})
$objForm.Controls.Add($btn)
}
[void] $objForm.ShowDialog()

IF ($objForm.DialogResult -eq "OK"){  
Write-Host "Auswahl:"  
$Buttonauswahl
}