public function removeItems( $items ) {
		foreach ( $items as $item ) {
			$index = array_search( $item, $this->items, true );
			if ( $index !== false ) {
				$item->setElementGroup( null );
				array_splice( $this->items, $index, 1 );
			}
		}

		// Update actual target element contents to reflect our list
		$this->group->clearContent();
		$this->group->appendContent( $this->items );

		return $this;
	}