How to move selected items from one select drop down to another one in xforms on click of a button

Hi,

I have two compact list boxes if a select one or more item from right list
box and click on << button it should move to the left box , same if i select
one or more items from left list box and click on >> button it should move
items to the right list box...

Thanks in advance

-- 
b.s.shashikiran