I am trying to simply show a map with a marker set to the given geolocation. But the mapOptions doesn't seem to work, it just keeps showing some place in America. Am I doing it right?

Code:
                    {
                        xtype: 'map',
                        title: 'MyMap',
                        height: 202,
                        width: '100%',
                        mapOptions: 'center : new google.maps.LatLng(-37.20097, 145.08719)'
                    }
Thanks