private void PressLanguageServiceButton_Cmd(LanguageService service)
 {
     string url = service.ContextURL(CurrentWord.word_of_dictionary,CurrentWord.TargetLanguage, CurrentWord.NativeLanguage);
     if (string.IsNullOrEmpty(url))
     {
         SystemMessage.Show("Can't get URL for "+service);
         return;
     }
     NavigationService.OpenDialog(Views.WebBrowserForm,new WebBrowserForm_parameters { Address = url, Title = service.Name + "   " + CurrentWord });
 }