Action to toggle-expand a row in a GtkTreeView

["Padraig O'Briain" <Padraig Obriain Sun COM>]

Brian, Bill,

Do we intend to have an accessible object which corresponds to a row in a 
GtkTreeView?

I have seen the transcript of an xchat session between Brian and Jonathon 
Blanford in which there was a reference to implementing AtkAction on a cell 
(presumably any cell of a row) rather than on the row.

Is there a consensus on this?

Padraig