DependencyObject RoutedEventHandler event not call more than 5 time

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C#

WPF

I have created one class like.......

public class UIElementClass:UIElement
    {
        public XmlLanguage Language
        {
            get { return (XmlLanguage)GetValue(LanguageProperty); }
            set { SetValue(LanguageProperty, value); }
        }

        public static readonly DependencyProperty LanguageProperty =
            DependencyProperty.Register("Language", typeof(XmlLanguage),
            typeof(UIElementClass), new UIPropertyMetadata(LanguagePropertyChangedCallback));

        protected static void LanguagePropertyChangedCallback(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            (sender as UIElement).RaiseEvent(new RoutedEventArgs(LanguageChangedEvent));
        }

        public static readonly RoutedEvent LanguageChangedEvent = EventManager.RegisterRoutedEvent(
            "LanguageChanged", RoutingStrategy.Tunnel, typeof(RoutedEventHandler), typeof(UIElementClass));

        public event RoutedEventHandler LanguageChanged
        {
            add { AddHandler(LanguageChangedEvent, value); }
            remove { RemoveHandler(LanguageChangedEvent, value); }
        }
    }

In this class one LanguageChanged event is there.That event i have call like....

_languageUIElement.LanguageChanged += new RoutedEventHandler(delegate(object sender, RoutedEventArgs e)
                  {
                    //Here some code to change the language                   
});

This event not work more then 5 times.Only 5 times give the output.That event call on button click.
I am using wpf with c#.net.