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copied!<p>That's better.</p> <p>This is how I would solve it. Not too much explanation since best explanation is code ;).</p> <pre><code>public class IncrementalLoadingCollection<T> : ObservableCollection<T>, ISupportIncrementalLoading { // todo; write a lot of magic here.(VIEW) } // IN PCL public abstract class PortableFactory { private static PortableFactory _factory; public static PortableFactory Current { get { if (_factory == null) { throw new InvalidOperationException(); } return _factory; } set { _factory = value; } } protected PortableFactory() { // note we auto-set current here, // which saves an extra step for the caller Current = this; } public abstract IList<T> GetIncrementalCollection<T>(); } // IN XAML APP public partial class App : Application { private PortableFactory _pf = new WPFPortableViewFactory(); private class WPFPortableViewFactory : PortableFactory { public override IList<T> GetIncrementalCollection<T>() { return new IncrementalLoadingCollection<T>(); } } } // IN VIEWMODEL public class ViewModel { public IList<Car> Cars { get; set; } public ViewModel() { Cars = PortableFactory.Current.GetIncrementalCollection<Car>(); } } </code></pre> <p>the code was taken here(with few modifications): <a href="http://blogs.msdn.com/b/sburke/archive/2011/02/03/using-observablecollection-with-the-portable-library-tools-ctp.aspx" rel="nofollow">http://blogs.msdn.com/b/sburke/archive/2011/02/03/using-observablecollection-with-the-portable-library-tools-ctp.aspx</a></p>

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