gtk.TreeView cell inconsistent state

[johnthawk]

In the below code setting cell to inconsistent sets entire column inconsistent (renderer).However, I need a third state off | on | inconsistent . How can I change one path->cell?
Any help appreciated.

Thanks
john

# get current value
fixed = model.get_value(iter, MARK_FOR_COLUMN)
icont = model.get_value(iter,MARK_FOR_INCONSISTENT)
# clear for action
model.set(iter,MARK_FOR_INCONSISTENT,False)
cell.set_property('inconsistent',False)
cell.set_property('active',False)
# ready for action
# find resolution to all being marked inconsistent
# flip modified as we are changing it
model.set_value(iter,MODIFIED_COLUMN,not modified)
if icont:
cell.set_property('inconsistent',True)
else:
model.set(iter,MARK_FOR_INCONSISTENT, not icont)
model.set(iter, MARK_FOR_COLUMN, not fixed)
model.set(iter,ICON_COLUMN, icon)
model.row_changed(path,iter)
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