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POObservableCollection not updating the control
 

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    <p>I am having a Telerik TransitionControl which displays advertisements to to end user. the logic is written in such a way that the ad images will be downloaded asynchronously in the behind. the control will display images as it is available. I am using ObservableCollection to hold the advertisement images.New image information is added to this ObservableCollection when a image is successfully downloaded. However, the Telerik TransitionControl is not getting updated with the new images.</p> <p>I believe the ObservableCollection does not need the OnNotifyPropertyChanged to be called as it will be called internally</p> <p>Code is given below</p> <pre><code>//Inside the AdvertUserControl.xaml.cs ViewModel vm = new ViewModel(); DataContext = vm; this.radControl.SetValue(AdRotatorExtensions.AdRotatorExtensions.ItemsSourceProperty, vm.SquareAdsVertical); </code></pre> <p>//Inside the ViewModel.cs</p> <pre><code> public ReadOnlyObservableCollection&lt;Advert&gt; SquareAdsVertical { get { if (AdsManager.VerticalAds == null) { return null; } return new ReadOnlyObservableCollection&lt;Advert&gt;(AdsManager.VerticalAds); } } // Inside DownloadManager.cs private static ObservableCollection&lt;Advert&gt; adsToShowVertical = new ObservableCollection&lt;Advert&gt;(); public static ObservableCollection&lt;Advert&gt; VerticalAds { get { if (adsToShowVertical != null) return adsToShowVertical; return null; } } public static void OnDownloadComplete(Object sender, AsyncCompletedEventArgs e) { try { if(!e.Cancelled) { if (e.Error == null) { Advert ad = e.UserState as Advert ; adsToShowVertical.Add(ad ); } } </code></pre>
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