Tree Connector

I’ve loaded a tree with tree_connector, and it loads the values from MySQL database:

<?php
	require_once('../connect/config.php');
	require_once("../codebase/tree_connector.php");
	$res=mysql_connect($dbhost, $dbuser, $dbpass);
	mysql_select_db("my_database");
        $treeConn = new TreeConnector($res,"MySQL");
	$treeConn->render_table("my_tablename","node_id","node_name","","node_parent");
?>

I would like to know, how can I set it so it also reads the value node_isopen from my database?
So that the nodes will be open or closed depending on previous user choice.

Also, I watched the video to use dhtmlxdataprocessor.js, but my values in tree do not save to database. Is this html correct?

		var stree = new dhtmlXTreeObject("scenTree","100%","100%",0);
		stree.setImagePath("codebase/imgs/csh_bluebooks/");
		stree.enableDragAndDrop(true, true);
		stree.setDragBehavior("complex", true);
		stree.enableKeyboardNavigation(true);
		stree.enableItemEditor(true);
		stree.enableContextMenu(treemenu);
		stree.loadXML("connect/get_stree.php");
		var treedp = new dataProcessor("connect/get_stree.php");
		treedp.init(stree);

(a)
Similar to
docs.dhtmlx.com/doku.php?id=dhtm … d_and_tree
you can use

if (some) $item->set_attribute("open",1);

(b)
Be sure to include dhtmlxconnector.js as well