CellRendererText doesn't have clicked signal now what?

I have a treeview with:

COL1      COL2     COL3
toggle | string | string


I want if the user clicks on the text on a row of *col2* or *col3* to
toggle the bool in the *col1*.
I cannot find a way to do that in GTK.

with respect to David Cook, I don't know if this is useful or not:
http://www.async.com.br/faq/pygtk/index.py?req=show&file=faq13.026.htp
but even if it was, I cannot understand what it says [so either way plz
someone that knows what it's saying edit it to become more easy to
understand for the rest of us]

Thank you in advance
-- 
Nikos Kouremenos | http://members.hellug.gr/nkour | JabberID: nkour@xxxxxxxxxx

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