GtkTree selection in gtk1.2

[mrl netbank com br]

Hi,

Is there a way to block the user from selecting the subtree root?
Eg:
tree1
  ^--- subtree1
          ^--- subtree2
I wanna make it only allows the subtree2 to be selected.. not subtree1 neither tree1..
I was thinking about using the select signal to change the selection, but I think it's not the best way..
Any idea?

Thanks for helping,
-- 
Marcelo R Leitner <mrl netbank com br>
ICQ #: 29966851