Powershell - Menüleiste erstellen

Add-Type -A System.Windows.Forms

$form = New-Object System.Windows.Forms.Form -P @{
    ClientSize = '200,80'  
    Text = "MenuStrip"  
}

$menu = New-Object System.Windows.Forms.MenuStrip -P @{
    Dock = 'Top'  
}
$menuitem_datei = New-Object System.Windows.Forms.ToolStripMenuItem "Datei" -P @{  
    Name = "Datei"  
}
$menuitem_combobox = New-Object System.Windows.Forms.ToolStripComboBox "Combobox" -P @{  
    Name = "Combobox"  
}

$test = $menuitem_datei.DropDownItems.Add("Test")  
$test.add_Click({
    [System.Windows.Forms.MessageBox]::Show("This is a Test")  
})

$menuitem_combobox.Items.AddRange(@("Wert1","Wert2"))  
$menuitem_combobox.add_SelectedIndexChanged({
    [System.Windows.Forms.MessageBox]::Show("You selected value '$($this.SelectedItem)'")  
})

[void]$menu.Items.Add($menuitem_datei)
[void]$menu.Items.Add($menuitem_combobox)

$form.MainMenuStrip = $menu
$form.Controls.Add($menu)
[void]$form.ShowDialog()