Cellrenderer and datagrid

Can anyone help me figure out how to use the CellRenderer code in AS3.0 so that it functions similarly to AS2.0? Lets take for example… putting a checkbox in a datagrid… or a custom movie clip (like a progress bar - which is what I want to do). I’ve been working on it and it doesn’t seem to work. I can get a movie clip into a cell, but when I scroll the DataGrid everything gets screwed up.

Anyone have experience with this? I need to use AS3.0 for the functionality of its uploading/downloading (like receiving data onComplete or uploads).

thanks a ton.