private void Initialize()
{
BasemapListView.ItemsSource = _basemapNames;
LayerListView.ItemsSource = _operationalLayerUrls;
// Show a plain gray map in the map view
MyMapView.Map = new Map(Basemap.CreateLightGrayCanvas());
// Update the extent labels whenever the view point (extent) changes
MyMapView.ViewpointChanged += (s, evt) => UpdateViewExtentLabels();
}