ItemsControl and CollectionViewSource

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WPF

Hello!

I want to filter ObservableCollection<> before binding it to ItemsControl.ItemsSource.

Here the code I use:

private ObservableCollection<IControlableModel> _controls = null;
public ObservableCollection<IControlableModel> Controls
{
    get
    {
        if (_controls == null)
        {
            _controls = new ObservableCollection<IControlableModel>();
        }
        return _controls;
    }
    set
    {
        _controls = value;
        OnPropertyChanged("Controls");

    }
}

CollectionViewSource _notMaskedControls = null;
public CollectionViewSource NotMaskedControls
{
    get
    {
        if (_notMaskedControls == null)
        {
            _notMaskedControls = new CollectionViewSource() { Source = Controls };
        }
        return _notMaskedControls;
    }
}

If I bind ItemsControl.ItemsSource to Controls I see all the Items, but if I bind the same ItemsSource to NotMaskedControls no items appears.

Please help