SelectedItem set to first item with CollectionViewSource

I have a view databound through mvvm light to a viewmodel in my WP7 project. The view contains a Listbox with following settings:

<ListBox x:Name="StationList"
    ItemsSource="{Binding StationList}"
    SelectedItem="{Binding SelectedStation, Mode=TwoWay}"
    >

The StationList is a ObservableCollection.

Now when the view gets loaded, everything looks great! The list is shown and NO item is selected!

But when I change the XAML to:

<ListBox x:Name="StationList"
            ItemsSource="{Binding Source={StaticResource StationListSorted}}"
            SelectedItem="{Binding SelectedStation, Mode=TwoWay}"
            >

With the StationListSorted being a simple one property sort on the StationList as a CollectionViewSource. Now things turn ugly!! The same view is loaded with the same items in the listbox, but开发者_Go百科 now correctly sorted, BUT the first item is selected and the selectedItem property is set!!

How can I sort a ListBox with a CollectionViewSource WITHOUT it auto selecting my first item?

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On your listbox, try setting IsSynchronizedWithCurrentItem and see which value (either true or false) produces the desired effect.