Really dismiss reminders in Sunbird Reminder window

The Sunbird Reminder window is quite neat to pop up the reminders if the tasks/events are lapsed.

However, it is noticed that if you "Dismiss" the event, it will pop up later again. What I do is to click on the "Details" of the event in the Reminder window, bring up the "Edit event" window, and set the Reminder option as "No Reminder". Thus prevents the reminder from popping up again.

For the repeative events, you will need to "Edit just this occurance".

Really dismiss reminders in Sunbird Reminder window