private string GetDesignModeValue()
        {
            var    provider = DesignTime.GetTranslationProvider(this._parent) ?? TranslationManager.TranslationProvider;
            string language = DesignTime.GetLanguage(this._parent);
            var    culture  = language == null ? TranslationManager.CurrentLanguage : new CultureInfo(language);

            if (provider == null || culture == null)
            {
                return(string.Format("!!{0}.{1}!!", this._group, this._key));
            }

            return(provider.Translate(this._group, this._key, culture));
        }