Records retention in grids

I have a pop-up that opens on clicking an icon. Now in that pop-up I have two grids and I move one row of records from one grid to the other. Now I close the pop-up. When I reopen the pop-up again I would like to view the row retained in the second grid and missing from the first grid. Can you let me know how can this be possible.

Hi!

If you are just hiding the popup, it should retain the same values for the repeaters. Are you loading another page in an iFrame?