Inheritance: GalaSoft.MvvmLight.Messaging.MessageBase
        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            if (pageState != null && pageState.ContainsKey("SearchQueryMessage"))
            {
                _searchQueryMessage = pageState["SearchQueryMessage"] as SearchQueryMessage;
                Messenger.Default.Send<SearchQueryMessage>(_searchQueryMessage);
            }
            else if (navigationParameter != null)
            {
                if (navigationParameter is SearchQueryMessage)
                {
                    _searchQueryMessage = navigationParameter as SearchQueryMessage;
                    Messenger.Default.Send<SearchQueryMessage>(_searchQueryMessage);
                }
                else if (navigationParameter is string)
                {
                    _searchQueryMessage = new SearchQueryMessage { Query = navigationParameter as string };
                    Messenger.Default.Send<SearchQueryMessage>(_searchQueryMessage);
                }
            }

        }
 private void OnSearchQuery(SearchQueryMessage queryMessage)
 {
     Query = queryMessage.Query;
     Results = new SearchResultsViewModelCollection(_baconProvider, Query);
 }