PtCalendar usage


In one of my applications, I 'm trying to change the system date,month &
year using the PtCalendar widget. After any change, the changed date ,
month and year should be set in a text box.For this, I’m writing code in
Pt_CB_CALENDAR_SELECT callback.But, I’m not successful.Can anyone send me
a snippet/ suggest some ideas as how to proceed?