public void Attach( DependencyObject associatedObject )
        {
            if ( DesignMode.DesignModeEnabled )
            {
                return;
            }

            AssociatedObject = associatedObject;
            _map = (MapControl) associatedObject;
            _labelsOverlay = new Image();
            _labelsOverlay.ImageOpened += ( _, __ ) =>
            {
                Geopoint topLeft;
                _map.GetLocationFromOffset( new Point( 0, 0 ), out topLeft );
                MapControl.SetLocation( _labelsOverlay, topLeft );
                _labelsOverlay.Visibility = Visibility.Visible;
            };
            _map.Children.Add( _labelsOverlay );

            _map.Loaded += ( _, __ ) =>
            {
                _vm = (MainViewModel) _map.DataContext;

                OnFloorChanged( _vm.Properties.Floor );
                OnItemsChanged( _vm.SearchResults );

                _properties = _vm.Properties;

                _vm.Properties.ListenToProperty( x => x.Center, UpdateLabelsOverlay );
                _vm.Properties.ListenToProperty( x => x.Floor, UpdateLabelsOverlay );
                _vm.Properties.ListenToProperty( x => x.ZoomLevel, UpdateLabelsOverlay );
                UpdateLabelsOverlay();

                _vm.Properties.ListenToProperty( x => x.Floor, () => OnFloorChanged( _vm.Properties.Floor ) );
                _vm.ListenToProperty( x => x.SearchResults, () => OnItemsChanged( _vm.SearchResults ) );

                var buildingsDataSource = EpflTileSources.GetForBuildings( _vm.Properties );
                _map.TileSources.Add( new MapTileSource( buildingsDataSource ) );
            };

            // HACK: Force the map to always face North, so that buildings labels are shown properly.
            _map.HeadingChanged += ( _, __ ) => _map.Heading = 0;
        }