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PO
 

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    <p>I would try checking if the binding ever fires with a DebugConverter - check the <a href="http://winrtxamltoolkit.codeplex.com/SourceControl/changeset/view/13396#270576" rel="nofollow">BindingDebugConverter</a> in the <a href="http://bit.ly/WinRTXamlToolkit" rel="nofollow">WinRT XAML Toolkit</a> - set it as a converter for your binding and see if and when it breaks (is it in Convert or ConvertBack, what value is being set etc.).</p> <p>If that does not help - check if your DataContext is set correctly.</p> <p>*EDIT 1</p> <p>If what you are looking is changes in the items of the bound collection - you can check if ItemsSource is an <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.interop.inotifycollectionchanged.aspx" rel="nofollow">INotifyCollectionChanged</a> and if true - subscribe to the <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.interop.inotifycollectionchanged.collectionchanged.aspx" rel="nofollow">CollectionChanged</a> event to see the changes. Otherwise - you could modify your control to inherit from <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.controls.itemscontrol.aspx" rel="nofollow">ItemsControl</a> and override methods like <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.controls.itemscontrol.getcontainerforitemoverride.aspx" rel="nofollow">GetContainerForItemOverride</a> and <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.controls.itemscontrol.isitemitsowncontaineroverride.aspx" rel="nofollow">IsItemItsOwnContainerOverride</a>.</p> <p>*EDIT 2</p> <p>It seems like there is <a href="http://social.msdn.microsoft.com/Forums/en/winappswithcsharp/thread/6a579bce-bdb4-4a41-a1b2-6d94153e4c00" rel="nofollow">a bug</a> in the framework in Windows 8 Consumer Preview related to using IEnumerable as the type of a dependency property. Using object as the type solves the problem. If you enable native code debugging you will see this binding exception:</p> <blockquote> <p>Error: Converter failed to convert value of type 'System.Collections.ObjectModel.ObservableCollection`1[[ACBDP.Person, ACBDP, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' to type 'IEnumerable'; BindingExpression: Path='Persons' DataItem='ACBDP.BlankPageViewModel, ACBDP, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; target element is 'ACBDP.AutoCompleteBox' (Name='null'); target property is 'ItemsSource' (type 'IEnumerable'). </p> </blockquote>
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    1. USFilip Skakun
    1. USFilip Skakun
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    1. COI've attached the BindingDebugConverter to the property I am binding, all is swell there. The dataContext is correct since other data on the page is coming from the same viewModel. Output from the BindingDebugConverter: BindingDebugConverter.Convert(value:System.Collections.ObjectModel.ObservableCollection`1[Carma.Model.Person], targetType:System.Collections.IEnumerable, parameter:<null>)
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    2. COUpdated the answer since I think I understand what you wanted better now.
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    3. CORight now, I am just trying to get the ItemsSource property set/instantiated on the control. The SetValue for the ItemsSource property is never called. In the control, the items source property is null, when it should be the data that i bound it to from the viewmodel.
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