<?php

class DesignerPage extends Page {

	static $description = 'Designers weergeven en toevoegen/bewerken';

	static $has_many = array(
		"Designers" => "Designer"
	);

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

		// $fields->removeFieldFromTab("Root.Main","Content");

		$gridFieldConfig = GridFieldConfig::create()->addComponents(
			new GridFieldToolbarHeader(),
			new GridFieldAddNewButton('toolbar-header-right'),
			new GridFieldSortableHeader(),
			new GridFieldDataColumns(),
			new GridFieldPaginator(10),
			new GridFieldEditButton(),
			new GridFieldDeleteAction(),
			new GridFieldDetailForm()
			// new GridFieldSortableRows('SortOrder')
		);

		$gridField = new GridField("Designers", "Designers", $this->Designers(), $gridFieldConfig);

		$fields->addFieldToTab("Root.Designers", $gridField);

		return $fields;
	}

}
class DesignerPage_Controller extends DesignerViewer {

	public function init() {
		parent::init();

	}

}

<?php

class DesignerViewer extends Page_Controller {

	function designer(){
			//needed for avoiding (+) signs on urls
			$pid = Convert::raw2url($this->URLParams['ID']);

			$designer = Designer::get()->filter('URLSegment' , $pid)->First();
			if($designer){
				return $this->customise( array('Designer'=>$designer,'Title'=>$designer->Naam))->renderWith(array("DesignerPage_designer","Page") );
			}
			return $this->httpError(404);
		}

}