private void CreateBindings()
        {
            FileTextBox.SetBinding(TextBox.TextProperty, new Binding("File")
            {
                Source = _model,
                Mode   = BindingMode.OneWay
            });

            ItemComboBox.SetBinding(ItemsControl.ItemsSourceProperty, new Binding("Items")
            {
                Source = _model,
                Mode   = BindingMode.OneWay
            });
            ItemComboBox.SetBinding(Selector.SelectedItemProperty, new Binding("Item")
            {
                Source = _model,
                Mode   = BindingMode.TwoWay
            });
            _model.ItemChanged += SelectedItemChanged;

            SaveButton.SetBinding(IsEnabledProperty, new Binding("SaveButtonEnabled")
            {
                Source = _model,
                Mode   = BindingMode.OneWay
            });
        }