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DHTMLX Ttree - Plus sign- How to eliminate if item has no children

I have a tree that loads an xml and it works perfectly....
But i have a bit problem.
All items have by default the plus sign. Not only the items with childrens have the plus.

How can i solve this?
Thanks

The "+" sign show when
a) XML has child rows in XML 
b) row tag has xmlkids attribute set

If to mentioned issues is not actual in your case - please provide a snippet of XML for which problem occurs.