Combobox. Свойства ValueMember и DisplayMember в powershell?

cls
[array]$test  = Get-ADOrganizationalUnit -filter * -SearchBase "dc=DOMAIN,dc=local"

Function funMainForm {
    $Global:main_form = New-Object System.Windows.Forms.Form
    $main_form.Text ='Окно'
    $main_form.Width = 600
    $main_form.Height = 480
    $main_form.AutoSize = $true

    $Global:cmbTest = New-Object System.Windows.Forms.ComboBox
    $cmbTest.Width = 620
    $cmbTest.DisplayMember = "name"
    $cmbTest.ValueMember = "DistinguishedName"
    $cmbTest.DataSource = $test
    $cmbTest.Location = New-Object System.Drawing.Point(10,50)
    $main_form.Controls.Add($cmbTest)

    $main_form.ShowDialog()
}

funMainForm