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:The loading tree by AJAX can be done by two methods:

• loadXML(url) - load xml from server by url ( sample can be checked here - http://scbr.com/docs/products/dhtmlxTree/samples/treeEx11.html )
• loadXMLString(string) - load xml from string, which retrieved from server by some third party AJAX library

Both functions are accessible from dhtmlxtree.js and exist in common and pro versions (mentioning dhtmlxtree_gr.js in documentation caused by incorrect documentation generation, there is no such extension at all, and most functions, mentioned as placed in dhtmlxtree_gr.js, exist in dhtmlxtree.js)

Not much can be said in addition to the reply above, but you also can check xml editor javascript and google scheduling calendar and find out what we have probably missed in our explanation.