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Tree Serialization problem

Hi,

I have problem during serialization of tree when there is more than one level of hierarchy in the tree.

Below in my code (restoreBlock): I am using 2 dhtmlxtrees: undotree and tree.

In the restoreBlock() , i get rid of the selected node from undotree, insert a new node in tree and save the tree.

when i call the xmlhttprequestSave(): than it fails during the serialization of the tree. It fails only when there is more than one level of hierarchy in the tree.

Situations in which serialization doesnt fail:

1. level of hierarchy in the tree: 1
2. even though the tree has more than 1 level of hierarchy, it doesnt fail the first time but after that it fails all the time.

In certain situations deleting a node returns this error:

deleteselectednode: [Exception... "Component returned failure code: 0x80004003 (NS_ERROR_INVALID_POINTER) [nsIDOMSerializer.serializeToString]" nsresult: "0x80004003 (NS_ERROR_INVALID_POINTER)" location: "JS frame :: http://localhost:8080/scholion/design2/dhtmlxtree_xw.js :: anonymous :: line 9" data: no]



Could it be a bug in the serialization tree? Any suggestion is highly appreciated

TC :)


--------------------------------------------------- code ------------------------------------------------------

function restoreBlock()
    {
        var selectitem = undotree.getSelectedItemId();
        var currentitemcount = itemcount;
        
            undotree.deleteItem(selectitem,true);
            tree.insertNewItem(-1,currentitemcount,"new title",0,0,0,0,'SELECT');            
         .................
            xmlhttprequestSave();
            .......
        }        
    }



function xmlhttprequestSave()
    {
        //tree.stopEdit();
     var myXmlStr = tree.serializeTree();    
    
.............

        xmlhttp.open("POST", saveLUTreeURL ,true);
        xmlhttp.onreadystatechange=function() {
                if (xmlhttp.readyState==4) { }
             }
        xmlhttp.setRequestHeader("Content-Type", "text/xml");
        xmlhttp.send(myXmlStr);
    }