public EventsListPage()
 {
     InitializeComponent();
     MessagingCenter.Subscribe <DetailsPage>(this, "RefreshFromSignup", this.RefreshFromSignup);
     MessagingCenter.Subscribe <FilterEventsPage, FilterModel> (this, "Filter", (childPage, filter) => {
         var currentFilter = m_Filter;
         m_Filter          = filter;
         if (m_Filter != null && m_Filter.IsEquals(currentFilter))
         {
             Navigation.PopModalAsync();
             return;
         }
         UpdateList();
         Navigation.PopModalAsync();
     });
 }