Fix multiple calendars in Google Calendar (Android)

Normally, a gmail account is used with multiple calendars (own and subscribed calendars). By default, the handling of the multiple calendars in the Google Calendar for Android is poor and buggy. On my Gingerbread phone (Samsung Galaxy W), the multiple calendars showed up randomly and I was never be able to get it working. Until now because the Business Calendar Free can see and configure all of the calendars for multiple accounts without problems (shame on Google):

1. Install the Business Calendar Free application from the Google Play (aka Google Market).
2. Start the Business Calendar Free and check in the interested calendars during the wizard in the first startup.
3. Ready. The selected calendars will show up in the official Google Calendar app as well, the Business Calendar Free can be uninstalled.