haxe
    public function addNode(text:String, icon:String = null, isExpandable:Bool = false, expanded:Bool = false):TreeViewNode {
        _hbox.styleString = "spacing: 0";
        
        var node = new TreeViewNode(_tree);
        node.expandable = isExpandable;
        if (expanded == true) {
            node.expand();
        }
        node.parentNode = this;
        node.marginLeft = 16;
        node.text = text;
        node.icon = icon;

        var nodes:Array<TreeViewNode> = findComponents(TreeViewNode);
        nodes.push(node);
        nodes.sort(function(node1:TreeViewNode, node2:TreeViewNode) {
            if (node1.expandable == true && node2.expandable == false) {
                return -1;
            } else if (node1.expandable == false && node2.expandable == true) {
                return 1;
            }
            return Reflect.compare(node1.text, node2.text);
        });
        var index = nodes.indexOf(node);

        addComponentAt(node, index + 1);
        updateUI();
        
        return node;
    }