How to prevent/stop auto rearranging items when am item dragged from the list?

[sonasaran]

Hi,
i want to prevent the rearranging the items(filling the gap) when an item dragged from the list
for example:
I have3 items in my list called list1 (item1,item2,item3)
i am dragging item2 from the list and dropped in another list called list2
now item3 in list1 is automatically moved and occupies item2's place (item1,item3)
but i want (item1,empty place, item3) How can i achieve this?
Thanks,