<?php
class PricingHolder extends Page {

    private static $db = array();

    private static $has_many = array(
        'PriceItems' => 'PriceItem'
    );

    function getCMSFields() {

        $fields = parent::getCMSFields();

        $gridField = new GridField('PriceItems', 'Pricing Items', $this->PriceItems(), GridFieldConfig_RelationEditor::create());
        $fields->addFieldToTab('Root.PriceItems', $gridField);

        return $fields;

    }

}
class PricingHolder_Controller extends Page_Controller {}