private void ComposeData() { Root.Children.Clear(); foreach (CategoryEntity item in DataManager.Instance.Categories) { UICategoryEntity uiItem = UICategoryEntity.CreateFrom(item); if (uiItem.IsNull()) { continue; } Root.Children.Add(uiItem); } Root.IsSelected = true; //Root.Children = CollectionViewSource.GetDefaultView(source); //Root.Children.Refresh(); }