I need to add the sorting by latest ID so that i can still open the link and see the full 'Uudis' (News In estonian). But when i control the Uudis using control Uudised it will show all news and order them by id biggest id is the latest so it shows it on the top. Using SS2.4

Uudislist.php

class Uudislist_Controller extends Page_Controller
{
function show(){ 
      return array(); 
} 
    
   function Uudis(){ 
      if(isset($this->request) && $this->request->param('ID')){ 
         return DataObject::get_by_id('Uudis', (int)$this->request->param('ID')); 
      }    
   }
}

function Link(){ 
		return $this->Uudislist()->Link() .'show/'.$this->ID;    
	}

The default sort for DataObject is "Created", which is more relevant to what you want anyway (and basically equivalates to ordering by ID).
The issue is probably that Uudis seems to be a Page, which changes the default sort to "Sort" (an extra field added on SiteTree).

public static $default_sort = "Created DESC"; on Uudis class should hopefully do the trick.

worked like a charm. :)