Hi
I have

class Foto extends DataObject
...

and in my FotoPage

$manager = new ImageDataObjectManager(
			$this, // Controller
			'Fotos', // Source name
			'Foto', // Source class
			'Attachment', // File name on DataObject
			array(
				'Name' => 'Name', 
				'Description' => 'Description'
				//'Category' => 'Category'
			), // Headings 
			'getCMSFields_forPopup' // Detail fields (function name or FieldSet object)
			// Filter clause
			// Sort clause
			// Join clause
		);
		$f->addFieldToTab("Root.Content.Fotos",$manager);

in my _config.php
I set

SortableDataObject::add_sortable_classes(array('Foto'));

How to rearrange photos? Now when I add a Foto, it ceases at the end of the list. How to make it automatically becomes the first?
http://www.webspilka.com.ua/temp/foto_.png

You can probably just do

SortableDataObject::set_sort_dir("DESC");

Thanks
but SortableDataObject:: set_sort_dir ("DESC");
change the order of a site,
http://www.webspilka.com.ua/temp/foto_1.png

but the administrative part of it remained as before. How can I change the order for the admin part?

Right. The backend always reflects how the objects will be displayed on the frontend. Otherwise, it would be really confusing!

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Please tell if I have two classes.

class Foto extends DataObject ...
class MiniThumbs extends DataObject

For one (Foto) want to change the sorting site.
For the second (MiniThumbs) to leave as it was.

SortableDataObject::Foto:: set_sort_dir ("DESC");
SortableDataObject::MiniThumbs:: set_sort_dir ("DESC");

It can be done?