gistfile1.txt

<?php
class HomePage extends Page {

        public static $db = array(
        );

        public static $has_one = array(
        );

        public static $has_many = array('Images' => 'Image');

        public function getCMSFields() {
                $fields = parent::getCMSFields();

                $gridFieldConfig = GridFieldConfig_RelationEditor::create();
                $gridFieldConfig->getComponentByType('GridFieldAddNewButton')->setButtonName('Add New Image');
                $gridField = new GridField("Images", "Images", $this->Images(), $gridFieldConfig);
                $gridField->setRightTitle('Add images to the slider');
                $fields->addFieldsToTab('Root.Images', $gridField);

                return $fields;
        }
}