Issues with Tree Serialization

Hi,
This is in continuation to my earlier question (link provided below)

dhtmlx.com/docs/products/kb/index.php?s=normal&q=2269&a=2862

The serialized string still does not contain the custom attributes included by me in the XML
I tried doing  tree.setSerializationLevel(true ,true); 
but it did not work. What could be the issue…?

Thanks

Please contact us directly at support@dhtmlx.com , we will send you working sample.