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        public void FillTree()
        {
            List <Category> categories = new List <Category>();
            XDocument categoriesXML = XDocument.Load("place.xml");
            categories = this.GetCategories(categoriesXML.Element("Employees"));
            this.tree.ItemsSource = categories;
        }

        private List <Category> GetCategories(XElement element)
        {
            return (from category in element.Elements("Node")
                    select new Category()
                    {
                        Value = category.Attribute("placeID").Value,


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