Converter with collection

in WPF, in my XAML i have a dataGrid binded on a IEnumerable. The collection items have a proprety call开发者_开发知识库ed Sealed. To know if the order is sealed or not. So i've made a converter to switch it from one list to another. Altought, when i change the collection from the outside the converter is not being called. But if i close and reopen the window it works fine.

      public object Convert(object value, Type targetType, object parameter,   System.Globalization.CultureInfo culture)
    {
        var collection = (ObservableCollection<OrderEntry>)value;
        var viewSource = new CollectionViewSource()
        {
            Source = collection,
        };
        viewSource.Filter += new FilterEventHandler(FilterInSealedOrderEntries);
        return viewSource.View;
    }

    private static void FilterInSealedOrderEntries(object sender, FilterEventArgs e)
    {
        var orderEntry = e.Item as OrderEntry;
        e.Accepted = orderEntry != null && orderEntry.Sealed;
    }

"{Binding Path=OrderEntries.Collection, Converter={StaticResource ViewNotSealedOrderEntryCollectionValueConverter}}"

In my Xaml.

Whenever i change the property, the collectionContentChanged is being called but not the converter, any idea what am i doing wrong?

Thanks, i will comment if it's not clear enough.

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Because your specifying the ValueConverter in the Binding for the DataGrid ItemsSource it will only be called on initially populating the items.

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IValueConverter interface also contains ConvertBack method. I don't see this method in your code