Please describe the problem:
The predefined alarm types, for example "display an alert 15 minutes before the
start of the appointment" seem to work as expected.  However, if you create a
customised alarm, the alarm description appears in the dialogue box correctly,
but it is lost after the dialogue box is closed.

Steps to reproduce:
1. Create a new appointment.

2. Click the "Alarms" toolbar button in the new appointment dialogue box.

3. The drop-down list against "Alarm" will read "None".  Change this to say
"Customize".

4. Click "Add" and create an alert for, for example, ten minutes before the
start of the appointment.

5. Close the Alarms dialogue box and save your new appointment.

6. Reopen the appointment you just created and click "Alarms" again.

Actual results:
At step 3, the "Action/Trigger" box will read "Pop up an alert -1 minutes before
the start of the appointment".  This is not quite right, but it is really only a
cosmetic issue.

More importantly, after step 6, the drop-down box against "Alarm" will read
"None", and the Action/Trigger box will read "Pop up an alert for an unknown
trigger type".  The alarm has genuinely been lost, as it also doesn't go off at
the proper time.

Expected results:
At step 3, I would expect the Action/Trigger box to be empty because I haven't
added any alarms yet.

After step 6, I would expect to see my alarm, displayed the same way it was
displayed when I first set it.

Does this happen every time?
Yes

Other information: