catching <esc> pressed in a dialog with entry and treeview

[Manu TM <manutm007 gmail com>]

Hi

I'm having a problem with a gkt dialog. I have packed in this dialog a 
gtk entry and a gtk treeview, so the user can either enter an url or 
pick one from a list. Everything works fine, I've also added code to 
catch double-click on the list. But I can't achieve to catch <esc> key 
pressed events to close/quit the dialog. I think that because of the 
other widgets packed in the dialog, <esc> keybing has changed. I've then 
added the code:
   g_signal_connect(G_OBJECT(dialog), "close", 
G_CALLBACK(esc_key_pressed), NULL);
along with an appropriate signal handler, but this doesn't do anything.
I have searched the web a lot but didn't find anything relevant so far. 
So, does anyone know of a way to do this or have a clue?
Many thanks in advance.

Manu Thomas-Maurin