The following info from that page may be of some use for you:
[indent]Note: do not directly set a position on the StreetViewPanorama when you wish to display custom panoramas, as such a position will instruct the Street View service to request the default Street View imagery close to that location. Instead, set this position within the custom StreetViewPanoramaData's location.latLng field.
The following example displays a custom Panorama of the Google Sydney office. Note that we don't use a map (or default StreetView imagery) here at all: