Google Web Toolkit : Tree.addTreeListener is deprecated what should I use instead.

Hello, 

I'm learning about the Google web toolkit from the book "Beginning Google Web Toolkit" 
I have got to the part where it starts using a Tree widget. 
It uses Tree.addTreeListener() which apparently is now deprecated. 
I can't work out what to use instead. 

There is a class called Category and I'm creating a tree of Category. 

The method below is where the problem is: 

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1.  protected Widget createCategoriesWidget() {  
2.     Tree categoryTree = new Tree();  
3.     categoryTree.setWidth("100%");  
4.     categoryTree.addTreeListener(new TreeListener() {  
5.       public void onTreeItemSelected(TreeItem item) {  
6.         selectedCategory = ((CategoryTreeItem)item).getCategory();  
7.         updateTasksList();  
8.       }  
9.     });  
10.       
11.     List<Category> categories = getAllCategories();  
12.     for (final Category category : categories) {  
13.       CategoryTreeItem item = createTreeItem(category);  
14.       categoryTree.addItem(item);  
15.     }  
16.     return categoryTree;  
17.   }  

Does anyone know how to rewrite this method so it isn't deprecated?

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