silverstripe-subsites/code/SubsiteAdmin.php

<?php
/**
 * Admin interface to manage and create {@link Subsite} instances.
 * 
 * @package subsites
 */
class SubsiteAdmin extends ModelAdmin
{
    private static $managed_models = array('Subsite');

    private static $url_segment = 'subsites';
    
    private static $menu_title = "Subsites";

    private static $menu_icon = "subsites/images/subsites.png";
    
    public $showImportForm=false;

    private static $tree_class = 'Subsite';

    public function getEditForm($id = null, $fields = null)
    {
        $form = parent::getEditForm($id, $fields);

        $grid=$form->Fields()->dataFieldByName('Subsite');
        if ($grid) {
            $grid->getConfig()->removeComponentsByType('GridFieldDetailForm');
            $grid->getConfig()->addComponent(new GridFieldSubsiteDetailForm());
        }

        return $form;
    }
}