What should I use instead of Tree.addTreeListener

Hi

I'm learning GWT from the book "Beginning Google Web Toolkit".

It uses a Tree widget and an addTreeListener which is now deprecated.

I cannot work out what I should use instead of addTreeListener.

The section of code where the problem occurs is shown below

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Tree categoryTree = new Tree();

categoryTree.addTreeListener(new TreeListener() {                                                                 // This is the line that is deprecated

        public void onTreeItemSelected(TreeItem item) {

                 selectedCategory = ((CategoryTreeItem)item).getCategory();

                 updateTaskList();

       }

       public void onTreeItemStateChanged(TreeItem item) {

      }

});

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Does anyone know what I should use instead of addTreeListener and how this section of code should be?

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