Tree with checkbox

Hi,
For example, I am using the following code:

var MyTreeCheckbox = AW.Tree.Item.subclass(); 



MyTreeCheckbox.create = function(){ 

    AW.Templates.Checkbox.create.call(this); 

} 



var treeValue = ["", true, false, "mixed", false, true, false]; 

var treeText = ["", "Home", "Favorites", "Font size", "Search", "Child1", "Child2"]; 

var treeImage = ["", "home", "favorites", "fontsize", "search"]; 

var treeView = {0:[1, 2, 3, 4], 1:[5, 6], 2:[7], 3:[8], 4:[9]}; 



var tree = new AW.UI.Tree; 

tree.setItemTemplate(new MyTreeCheckbox); 

tree.setItemValue(treeValue); 

tree.setItemText(treeText); 

tree.setItemImage(treeImage); 

tree.setViewCount(function(i){return treeView[i] ? treeView[i].length : 0}); 

tree.setViewIndices(function(i){return treeView[i]}); 

document.write(tree);

tree.onItemClicked = function(event, i){ 

        alert(i); 

}

But tree.onItemClicked dsn't work?
Please help.
Thanks.

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