inaccessible treeviews and tables

Hello,
A while ago I was trying to get some understanding on how to make 3rt 
party gtk apps accessible. At that time Alejandro Piñeiro pointed me to 
some docs and bugzilla entries describing the current situation.
Unfortunatelly I haven't still mastered that. I have at least realized 
and hopefully understood at least some verry basic things related to this.
For example currently I am able to set accessible labels and I am able 
to add / tweak relations between labels and the interactive controls 
they are supposed to label. I know this is not a big deal but I have 
already tweaked an app or two this way and I know it works fine.
Another thing what's currently on my radar are widgets that are often 
reported as tables or treeviews. Individual rows appear to be keyboard 
focusable however orca is unable to report their role and text.
I guess the common scenario is that the app developers tend to subclass 
Gtk.CellRenderer to create more visually appealing design. In this case 
if I understand correctly the content is directly drawn to the widget 
surface and proper accessibility related properties are skipped from the 
implementation entirely.
By reading gtk reference docs I have came accross a method 
gtk_cell_renderer_class_set_accessible_type () . That appears to be only 
info I was able to find related to Gtk.CellRenderer and accessibility. 
Can anyone please give me a hint so I might try move forward and try 
learning how to implement accessibility for a widget where 
Gtk.CellRenderer is used?
Do I need to care about Gtk.CellRenderer or should I just set 
accessibility related properties such as label and description for the 
affected widgets without looking at Gtk.CellRenderer? How do I refer to 
multiple treeview colums or table cells in such implementation? Is there 
an app or just a code example I should look into to see this in action?
I have seen widgets with incomplete accessibility like this in many apps 
but if my explanation is not accurate enough here are two from the top 
of my head. One is the list of torrents in the transmission-gtk 
svn://svn.transmissionbt.com/Transmission/trunk and the other is a 
contact list widget in a gtk3 based tox client called venom 
https://github.com/naxuroqa/Venom .
I will be looking into this some more, it may take me a while like it 
took me ages to figure out and get used to labelling and related stuff 
so I am just trying maybe with some hint I might master it better this time.

Thanks

Peter

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