ExtAspNet 图标有关问题

ExtAspNet 图标问题
ExtAspNet 里面有个tree控件 设置节点前面的图标 代码：

C# code

                    ExtAspNet.TreeNode node = new ExtAspNet.TreeNode();                    treeNode.Icon = ExtAspNet.Icon.Group;                    node.Icon = ExtAspNet.Icon.User;                    treeNode.Nodes.Add(node);