/**
  * Creates a 300x300 pixel map centered on Atlanta and adds it to the page.
  *
  * @return the created MapWidget instance.
  */
 protected MapWidget addDefaultMap() {
   LatLng atlanta = LatLng.newInstance(33.7814790, -84.3880580);
   MapWidget map = new MapWidget(atlanta, 8);
   map.setSize("300px", "300px");
   RootPanel.get().add(map);
   return map;
 }