What happens if you do it this way instead?

 Code:
$NewsRadioButton = $ActionFrame.Controls.Add("RadioButton")
$NewsRadioButton.Text = "Bericht weergeven"
$NewsRadioButton.Left = 5
$NewsRadioButton.Top = 15
$NewsRadioButton.Width = 230
$NewsRadioButton.Height = 15

$SharesRadioButton = $ActionFrame.Controls.Add("RadioButton")
$SharesRadioButton.Text = "Netwerkverbindingen maken"
$SharesRadioButton.Left = 5
$SharesRadioButton.Top = 30
$SharesRadioButton.Width = 230
$SharesRadioButton.Height = 15

$StandardSettingsRadioButton = $ActionFrame.Controls.Add("RadioButton")
$StandardSettingsRadioButton.Text = "Standaard instellingen"
$StandardSettingsRadioButton.Left = 5
$StandardSettingsRadioButton.Top = 45
$StandardSettingsRadioButton.Width = 230
$StandardSettingsRadioButton.Height = 15

$TempfoldersRadioButton = $ActionFrame.Controls.Add("RadioButton")
$TempfoldersRadioButton.Text = "Tijdelijke mappen aanmaken"
$TempfoldersRadioButton.Left = 5
$TempfoldersRadioButton.Top = 60
$TempfoldersRadioButton.Width = 230
$TempfoldersRadioButton.Height = 15