private void WpfMap_Loaded(object sender, RoutedEventArgs e)
{
    Map1.MapUnit = GeographyUnit.Meter;
    Map1.CurrentExtent = new RectangleShape(-10000000, 10000000, 10000000, -10000000);

    InMemoryFeatureLayer layer = new InMemoryFeatureLayer();
    layer.InternalFeatures.Add(new Feature(0, 0));
    layer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.Capital1;
    layer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

    LayerOverlay overlay = new LayerOverlay();
    overlay.Layers.Add(layer);

    overlay.TileCache = new FileBitmapTileCache("c:\\temp\\overlay");
    overlay.TileCache.TileMatrix.BoundingBoxUnit = GeographyUnit.Meter; 

    Map1.CurrentScaleChanged += (o, args) =>
    {
        Debug.WriteLine(args.CurrentScale);
    };

    Map1.Overlays.Add(overlay);

    Map1.Refresh();
}