public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = Windows.UI.Xaml.Navigation.NavigationCacheMode.Enabled;
_msg = App.Container.GetInstance<MessengerService>();
_msg.Register<Geopoint>(this, "PositionChanged", x => DrawPositionChanged(x));
_msg.Register<IEnumerable<Directory>>(this, "NearbySchoolsChanged", x => DrawNearbySchoolsChanged(x));
}