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Hello,

there is setItemStyle method. It allows to define style of an item- the third paramete is css string (not class name):

tree.setItemStyle(id,tree.getUserData(id,"css"));

But if use initialize the tree from xml, you can use the itemtext tag (PRO edition):

<item id="some_id"><itemtext><div class="class_name">text</div></itemtext></item>