NSDatePicker delegate

FROM : Robert Cerny
DATE : Thu Jul 27 21:27:26 2006

hi folks,
I have a hard time with NSDatePicker and believe that someone can 
help me. I have three instances of NSDatePicker, one displays 
day,month, year and the last two just time. Basically, I want all 
these have synchronized, it means the day, month and year should be 
same for all three.
I'm not sure how to do it. :( I tried to make my controller a 
delegate and use controlTextDidChange, but I never receive this 
notification.
Any idea? Did I choose completely wrong approach?

Thanks
Robert