gistfile1.js

RouteTool.mapController = SC.ObjectController.create(
/** @scope RouteTool.mapController.prototype */ {

  overlayObjects: new Array(),

  addRoute: function(sender, route) {
    if (!route) {
      var route = RouteTool.store.createRecord(RouteTool.Route, {
        points: [[37.772323, -122.214897], [21.291982, -157.821856], [-18.142599, 178.431], [-27.46758, 153.027892]],
        description: 'Test Route 1'
      });
    }

    this.get('overlayObjects').pushObject(route);

    console.log('Adding route to map:', route.toString());
  },

  overlayObjectsPropertyDidChange: function() {
    console.log('Overlays changed: ', this.get('overlayObjects'));
  }.observes('overlayObjects.[]')

}) ;