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How to exapnd the tree upto second level

I am populating tree with dynamic XML which is coming from server side. I am displaying tree to the user using DHTML dhtmlXTreeObject. Everything works fine. But when I display the tree it is just displaying the root node i.e., first level of the tree. My requirement is to expand the tree up to second level. How can I do this? Please help me.

Thanks in advance,
Lkotha

You can issue opening command from XML or javascript

In javascript

    tree.loadXML(url,function(){
       tree.openItem(top_level_id);
    });

or , by XML

<tree>
    <item id='some' text=' top one' open='1' >
       ....

I did it on the XML. It worked.

Thanks