When do open_sync() gets called from a calendar backend?

Hi,

I am a bit mystified, due to my lack of intellectual resources, about
the behavior of my calendar backend.

I have created the gconf source for the calendar and are trying to get
Evolution to call open_sync() on it, but that never happens. Instead I
am seeing set_mode_sync() and set_default_timezone_sync() being invoked
(in that order).

The next thing to happen is that Evolution tells me that it is unable to
open the calendar.

Do I have to invoke open_sync() myself at some appropriate time? 


Thanks,
  jules

BTW: I have invoked e_cal_backend_sync_set_lock(backend, TRUE) in
e_cal_backend_brutus_init() to force serialization of method
invocations.