private void okButton_Click(object sender, RoutedEventArgs e)
        {
            string flyoutCategoryName = Mytextbox.Text;

            if (!string.IsNullOrEmpty(flyoutCategoryName))
            {
                MenuItemFactory.addCategory(MenuItems, flyoutCategoryName);
                PhotoItemFactory.addCategory(flyoutCategoryName);
                PhotoItemFactory.getPhotoItemsByCategory(flyoutCategoryName, PhotoItems);
                TitleTextBlock.Text   = flyoutCategoryName;
                BackButton.Visibility = Visibility.Visible;
                Category = flyoutCategoryName;
                PhotoItemFactory.getAllLists(MenuItemsWithoutFavourites); //Hassan updated NEW
                foreach (var p in MenuItems)                              //Hassan added NEW
                {
                    if (p.Category.Length > 10)
                    {
                        splitViewPaneLength = ((p.Category.Length) * 15).ToString();
                    }
                }
                AddCategoryButton.Flyout.Hide();
            }
        }