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dhtmlxTree best way of tree building

Hi,

What's the best way to build a tree ?
1.
var tree=new dhtmlXTreeObject(document.getElementById('treeBox'),"100%","100%","ROOT");
tree.setImagePath("imgs/");
var t = tree.insertNewChild("ROOT","NODE1","New Node 1",0,0,0,0,"");
t = tree.insertNewChild("NODE1","NODE2","New\"'' Node 2",0,0,0,0,"");

2.
var tree=new dhtmlXTreeObject(document.getElementById('treeBox'),"100%","100%","ROOT");
tree.setImagePath("imgs/");
tree.loadXMLString("<tree id='ROOT'><item id='1' text='Node1'><item id='2' text='Node2'></item></item></tree>");

In my first sample, all items are opened. I try to add value CLOSE in the optionString parameter but it does'nt work.
tree.insertNewChild("ROOT","NODE1","New Node 1",0,0,0,0,"CLOSE");
How to do ?

Can I use performance methods like enableSmartRendering when I use insertNewItem method ?

Thanks