WPF: Применение IValueConverter

Все искал нормальный пример использования конвертеров в WPF и в итоге наткнулся на эту статью.
Немного переделанные исходники:

namespace IValueConverterDemo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

    public class YesNoToBooleanConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter,
        System.Globalization.CultureInfo culture)
        {
            switch (value.ToString().ToLower())
            {
                case "yes":
                case "да":
                    return true;
                case "no":
                case "нет":
                    return false;
            }
            return false;
        }

        public object ConvertBack(object value, Type targetType, object parameter,
        System.Globalization.CultureInfo culture)
        {
            if (value is bool)
            {
                if ((bool)value == true)
                    return "yes";
                else
                    return "no";
            }
            return "no";
        }
    }
}

и XAML:

<Window x:Class="IValueConverterDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:IValueConverterDemo"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:YesNoToBooleanConverter x:Key="YesNoToBooleanConverter" />
    </Window.Resources>
    <StackPanel Margin="10">
        <TextBox Name="txtValue" />
        <WrapPanel Margin="0,10">
            <TextBlock Text="Текущее значение: " />
            <TextBlock Text="{Binding ElementName=txtValue, Path=Text,
             Converter={StaticResource YesNoToBooleanConverter}}"></TextBlock>
        </WrapPanel>
        <CheckBox IsChecked="{Binding ElementName=txtValue, Path=Text,
         Converter={StaticResource YesNoToBooleanConverter}}" Content="Yes" />
    </StackPanel>
</Window>
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