How to disable use of proxy in jQuery UI sortables

How to disable use of proxy in jQuery UI sortables


How to disable use of proxy in jQuery UI sortables functionality?
I am sorting three DIV elements that contains iFrames inside it.
While
Dragging is started, for some time I am not able to view content
inside that iFrame which is being dragged as it is a proxy element
for
the original one. So, Is there any alternative for this?
How to use our own proxy element instead of default one?