ModelAdmin implementation Example ================= ```php /**** MyModelAdmin.php ****/ use SilverStripe\Admin\ModelAdmin; use SilverStripe\Forms\GridField\GridField; use UndefinedOffset\SortableGridField\Forms\GridFieldSortableRows; class MyModelAdmin extends ModelAdmin { private static $menu_title='My Model Admin'; private static $url_segment='my-model-admin'; private static $managed_models=array( 'MATestObject' ); public function getEditForm($id = null, $fields = null) { $form=parent::getEditForm($id, $fields); //This check is simply to ensure you are on the managed model you want adjust accordingly if($this->modelClass=='MATestObject' && $gridField=$form->Fields()->dataFieldByName($this->sanitiseClassName($this->modelClass))) { //This is just a precaution to ensure we got a GridField from dataFieldByName() which you should have if($gridField instanceof GridField) { $gridField->getConfig()->addComponent(new GridFieldSortableRows('SortOrder')); } } return $form; } } /**** MATestObject.php ****/ use SilverStripe\ORM\DataObject; class MATestObject extends DataObject { private static $db=array( 'Title'=>'Varchar', 'SortOrder'=>'Int' ); private static $default_sort='SortOrder'; } ```