CartPage::getCMSFields PHP Method

    public function getCMSFields()
    {
        $fields = parent::getCMSFields();
        if ($checkouts = CheckoutPage::get()) {
            $fields->addFieldToTab('Root.Links', DropdownField::create('CheckoutPageID', _t('CartPage.has_one_CheckoutPage', 'Checkout Page'), $checkouts->map("ID", "Title")));
        }
        $fields->addFieldToTab('Root.Links', TreeDropdownField::create('ContinuePageID', _t('CartPage.has_one_ContinuePage', 'Continue Shopping Page'), 'SiteTree'));
        return $fields;
    }

 /**
  *@return Fieldset
  **/
 function getCMSFields()
 {
     $fields = parent::getCMSFields();
     $fields->removeFieldFromTab('Root.Content.Messages.Messages.Actions', "ProceedToCheckoutLabel");
     $fields->removeFieldFromTab('Root.Content.Messages.Messages.Actions', "ContinueShoppingLabel");
     $fields->removeFieldFromTab('Root.Content.Messages.Messages.Actions', "ContinuePageID");
     $fields->removeFieldFromTab('Root.Content.Messages.Messages.Actions', "SaveOrderLinkLabel");
     $fields->removeFieldFromTab('Root.Content.Messages.Messages.Errors', "NoItemsInOrderMessage");
     $fields->addFieldToTab('Root.Content.Messages.Messages.Actions', new TextField('StartNewOrderLinkLabel', 'Label for starting new order - e.g. click here to start new order'));
     $fields->addFieldToTab('Root.Content.Messages.Messages.Actions', new TextField('CopyOrderLinkLabel', 'Label for copying order items into a new one  - e.g. click here start a new order with the current order items'));
     return $fields;
 }