reminder for custom fields in kaddressbook 4.3

Hallo everybody, I am new to this mailing list and I am using kontact 4.3.5 
mainly with the modules kaddressbook, kmail and ToDo list. Birthdays and 
anniversaries out of kaddressbook are used by korganizer reminder module to 
alarm in time. I defined an additional custom field "Namenstag" in 
kaddressmanager and would like the reminder module to interpret this field as 
well for alarming. I tried the manual from kaddressbook and different places 
on the net but I got no idea how to implement till now.
I would appreciate every help on this topic. Thanks in advance

with best regards Christof Ebentheuer
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