I have simple datagrid with 2 columns and 2 rows like this:

column 0   column 1
--------   ---------
image      textfield
image      textfield

Column 0 contains my ImageRenderer component.
Column 1 contains the DataGrid's default item renderer and editor: 
text, textfield.

First Problem:
How do I identify/get a reference to a particular instance of my 
ImageRenderer from, say, column[0], row[1]?

Second (related) Problem:
How do I get the ImageRender instance that corresponds to the row of 
the textfield that fires an event when edited?

I've been wrestling with this problem for days now, and I just can't 
seem to get a grasp on the communication/eventing infrastructure 
that's probably necessary to pull this off. Please help.

Thanks,
Bruce 






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