jquery treeview question

jquery treeview question

Dear all

In the treeview code example
I shulde call tree view add method as below
  1. branches = $("<li class='closed'><span class='folder'>New Sublist</span><ul><li><span class='file'>Item1</span></li><li><span class='file'>Item2</span></li></ul></li>").prependTo("#folder21");
     $("#browser").treeview({
     add: branches
     });



But if I don't call treeview({add: branches});
The tree seem to show normally.
Are there any trouble if I didn't call treeview({add: branches}); ?

Thanks in advanced