hi guys,
i'm currently doing a project using netbeans which is about warranty

using jCalendar 1.4.jar as my jDateChooser


i want to let it increment by a year whenever i put in my registration date.
Example: i put choose the date in "registration date" 2009-09-09, in the "Expiration date" it will auto increment by a year which will display 2010-09-09.

may i know where should i put the code in and what's the code i should type in to make this work?