[horde] Permissions to delete events

[Alexa Rodriguez]

Hi people!

I created a calendar for working with my working group, in this  
calendar the working group has the following permissions: to view, to  
read and to edit.
With these permits they can create, edit and view the events, so far all OK.

The point is that, I need that users can delete events created by  
themselves, but they can't delete the events created by other users.

It's possible?