in-App purchasing for windows phone 8 products are not showing

Hi all, i have build a game in unity and built it for windows phone 8 platform. Right now i am implementing in-App purchasing in native windows which is almost done, the problem that i have encountered that my register products do not show in a game except one. This is really confusing for me that only one product out of 4 shown and others not. here is my code that i have written in Visual studio to get all products from windows store. A little help will be very helpful. Thanks

  private async void RenderStoreItems()
         {
             picItems.Clear();
 
             try
             {
                 //StoreManager mySM = new StoreManager();
                 ListingInformation li = await Windows.ApplicationModel.Store.CurrentApp.LoadListingInformationAsync();
 
                 
                 foreach (string key in li.ProductListings.Keys)
                 {
                     ProductListing pListing = li.ProductListings[key];
                     
                     //System.Diagnostics.Debug.WriteLine(key);
 
                     string status = Windows.ApplicationModel.Store.CurrentApp.LicenseInformation.ProductLicenses[key].IsActive ? "Purchased" : pListing.FormattedPrice;
 
                     string imageLink = string.Empty;
                     MessageBox.Show("product ka naam hay: "+pListing.Name);
 
                     //if (pListing.Name == "Get 25 Hints")
                     //{
                         picItems.Add(
                             new ProductItem
                             {
                                 imgLink = key.Equals("AdBlocker") ? "block-ads.png" : "block-ads.png",
                                 Name = pListing.Name,
                                 Status = status,
                                 key = key,
                                 BuyNowButtonVisible = Windows.ApplicationModel.Store.CurrentApp.LicenseInformation.ProductLicenses[key].IsActive ? System.Windows.Visibility.Collapsed : System.Windows.Visibility.Visible
                             }
                         );
                    // }
                 }
 
                 pics.ItemsSource = picItems;
             }
             catch (Exception e)
             {
                 MessageBox.Show("Unable to load in app purchases" + e);
             }
         }