public TreeViewItemBuilderTests()
        {
            var viewContext = TestHelper.CreateViewContext();

            item = new TreeViewItem();
            builder = new TreeViewItemBuilder(item, viewContext);
        }
        public TreeViewItemBuilderTests()
        {
            var viewContext = TestHelper.CreateViewContext();

            item    = new TreeViewItem();
            builder = new TreeViewItemBuilder(item, viewContext);
        }