[SilverStripe] Page with Folder (always same name)

Page.php

<?php
class myPage extends Page {
	public static $has_one = array(
		'Folder' => 'Folder'
	);
	
	public function getCMSFields() {
		$fields = parent::getCMSFields();
		
		//$PhotoManager = new ImageDataObjectManager (/* some params here */);
		//$PhotoManager->setUploadFolder($this->Folder()->Title);
		//$PhotoManager->removeFolderSelection();

		//$ImageField = new ImageField('Image', 'myImage', null, null, null, $this->Folder()->Title);

		//$ImageField2 = new ImageUploadField('Image2', 'myImage2');
		//$ImageField2->setUploadFolder($this->Folder()->Title);
		
		return $fields;
	}
	function findOrMakeFolder() {
		$Title = SiteTree::generateURLSegment($this->Title);
		if ($this->Folder() && $this->Folder()->exists()) {
			$folder = $this->Folder();
		} else {
			$folder = Folder::findOrMake($Title);
			$folder->write();
		}
		$folder->setName($Title);
		$folder->Title = $Title;
		$this->FolderID = $folder->ID;
		$folder->write();
	}
	
	function onBeforeWrite() {
		$this->findOrMakeFolder();
		parent::onBeforeWrite();
	}
}

class myPage_Controller extends Page_Controller {
}