private function existingItem(News $owner, SiteConfig $siteConfig)
    {
        if (!$owner->ID) {
            $member = Member::currentUser();
            $this->field_list['Root.Main'][13] = ReadonlyField::create('Tags', $owner->fieldLabel('Tags'), _t('News.TAGAFTERID', 'Tags can be added after the item has been saved'));
            $owner->Type = 'news';
            $owner->Author = $member->FirstName . ' ' . $member->Surname;
        } else {
            if (class_exists('MultiSelectField')) {
                /** I like multiselectfield and needed a reason to commit something */
                $this->field_list['Root.Main'][13] = MultiSelectField::create('Tags', $owner->fieldLabel('Tags'), $this->owner);
            } else {
                $this->field_list['Root.Main'][13] = CheckboxSetField::create('Tags', $owner->fieldLabel('Tags'), Tag::get()->map('ID', 'Title'));
            }
            $this->field_list['Root.Main'][2] = LiteralField::create('Dummy', '<div id="Dummy" class="field readonly">
	<label class="left" for="Form_ItemEditForm_Dummy">Link</label>
	<div class="middleColumn">
	<span id="Form_ItemEditForm_Dummy" class="readonly">
		<a href="' . $owner->AbsoluteLink() . '" target="_blank">' . $owner->AbsoluteLink() . '</a>
	</span>
	</div>
	</div>'
            );
            if ($siteConfig->EnableSlideshow) {
                /** @var GridFieldConfig_RecordEditor $gridFieldConfig */
                $gridFieldConfig = GridFieldConfig_RecordEditor::create();
                $gridFieldConfig->addComponent(new GridFieldBulkUpload());
                $gridFieldConfig->addComponent(new GridFieldOrderableRows('SortOrder'));
                $gridFieldConfig->getComponentByType('GridFieldBulkUpload')->setUfSetup('setFolderName', $this->getRootFolderName($siteConfig));

                if (class_exists('GridFieldGalleryTheme')) {
                    $gridFieldConfig->addComponent(new GridFieldGalleryTheme('Image'));

                    /**
                     * as gallery theme breaks sorting with GridFieldOrderableRows
                     * let's use SortableRows as a fallback when installed
                     *
                     * @todo remove later this when gridfield extension works with gallery theme
                     */
                    if (class_exists('GridFieldSortableRows')) {
                        $gridFieldConfig->addComponent(new GridFieldSortableRows('SortOrder'));
                        $gridFieldConfig->removeComponentsByType('GridFieldOrderableRows');
                    }
                }

                $this->field_list['Root'][] = Tab::create(
                    'SlideshowImages', $owner->fieldLabel('SlideshowImages'), GridField::create(
                    'SlideshowImage', _t('News.IMAGES', 'Slideshow images'), $owner->SlideshowImages()
                    ->sort('SortOrder'), $gridFieldConfig)
                );
            }
        }
    }