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POSilverlight TabControl bound to ObservableCollection<string> not updating when collection changed
 

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    <p>Silverlight 3 app with a TabControl bound to an ObservableCollection using an IValueConverter. Initial the binding works (converter called) on app startup. Changes, Clear() or Add(), to the bound collection are not reflected in the TabControl... converter not called.</p> <p>note: the bound ListBox reflects the changes to the bound collection while the TabControl does not.</p> <p>Ideas?</p> <p>/jhd</p> <hr> <p><strong>The XAML binding...</strong></p> <pre><code>&lt;UserControl.Resources&gt; &lt;local:ViewModel x:Key="TheViewModel"/&gt; &lt;local:TabConverter x:Key="TabConverter" /&gt; &lt;/UserControl.Resources&gt; &lt;StackPanel DataContext="{StaticResource TheViewModel}"&gt; &lt;ListBox ItemsSource="{Binding Classnames}" /&gt; &lt;controls:TabControl x:Name="TheTabControl" ItemsSource="{Binding Classnames, Converter={StaticResource TabConverter}, ConverterParameter=SomeParameter}"/&gt; &lt;Button Click="Button_Click" Content="Change ObservableCollection" /&gt; &lt;/StackPanel&gt; </code></pre> <hr> <p><strong>The ViewModel...</strong></p> <pre><code>namespace DatabindingSpike { public class ViewModel { private ObservableCollection&lt;string&gt; _classnames = new ObservableCollection&lt;string&gt;(); public ViewModel() { _classnames.Add("default 1 of 2"); _classnames.Add("default 2 of 2"); } public ObservableCollection&lt;string&gt; Classnames { get { return _classnames; } set { _classnames = value; } } } } </code></pre> <hr> <p><strong>The converter (for completeness)...</strong></p> <pre><code>namespace DatabindingSpike { public class TabConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var source = value as ObservableCollection&lt;string&gt;; if (source == null) return null; var param = parameter as string; if (string.IsNullOrEmpty(param) || param != "SomeParameter") throw new NotImplementedException("Null or unknow parameter pasased to the tab converter"); var tabItems = new List&lt;TabItem&gt;(); foreach (string classname in source) { var tabItem = new TabItem { Header = classname, Content = new Button {Content = classname} }; tabItems.Add(tabItem); } return tabItems; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } } </code></pre>
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    1. COAny chance the default mode is OneTime? Will try setting the mode explicitly. /jhd
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    2. COTried explicit Mode=OneWay, no joy. I'll use the CollectionChanged event and re-set the TabControl.ItemsSource until I figure out a better way. /jhd
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    3. COI've created the extended tab control which works correctly with the ObservableCollection class. http://vortexwolf.wordpress.com/2011/04/09/silverlight-tabcontrol-with-data-binding/
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