Datepicker doesn't work with greybox

Datepicker doesn't work with greybox

Hi, I am trying to replace very odd datepicker control on my web site with nice jQuery control and just hit a brick wall as  jQuery widget doesn't work within greybox. Just nothing happens when you click on the textbox which linked to the calendar. I saw an old post about this problem and just wonder if  anyone has figured out how to implement a datepicker within greybox?
Many Thanks.