How to drag column data from one Data Grid to the anther?

How to drag column data from one Data Grid to the anther?
Hi,
I build an application in mx2004 and I have 2 dataGrid instants containing data.
I am looking for a way to let the user drag a row of data from a data grid and drop it in anther data grid.
I have an “EventListener” on “myListener.cellPress” caching the data, but I could not find a way to determine where to drop the data and how to insert it to the destination dataGrid.
Thank
Nimrod