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Data Model Questions

treedropdownfield problem




28 May 2014 at 6:31am Community Member, 3 Posts

Hello world!
I'm quite beginner in SilverStripe so apologies for every silly question :)
Sittuation looks like this:
I have a class called Component which extends Page class. Component needs to have a link to different internal page. According to all information provided by uncle Google and search on forum I should use treedropdownfield as a extention to CMS Field.
Here is my code:

class Component extends Page {

   static $description = 'New component of the page';
   public static $db = array(
      'Subtitle' => 'Varchar(255)'      

   public static $has_one = array(
      'LinkedPage' => 'SiteTree'
   public static $defaults = array(
      'ShowInMenus' => false
   public function getCMSFields(){

      $fields = parent::getCMSFields();
      $fields->addFieldToTab('Root.Extra', new TextField('Subtitle','Subtitle'));
      $fields->addFiledToTab('Root.Extra', new TreeDropdownField('LinkedPage', 'Link', 'SiteTree'));
      return $fields;
class component_Controller extends Page_Controller {

   public function init() {

/dev/build gives correct output, site is displayed properly but ... When I'm trying to open page (Component page type) via CMS for editing all what can I see is a blank screen.
So my question is... what I'm doing wrong?

And funny part of my post: