Expander's activate signal

[Marko Anastasov <marko marko anastasov name>]

Hello, today I noticed that Expander seems to lack a SignalProxy
for signal_activate. I got this error message as I tried to compile
usual signal connecting code:

error: ‘class Gtk::Expander’ has no member named ‘signal_activate’.

I'm using Fedora 4 with version 2.6.2 but I also checked the header
in the latest (2.8.2) source package from the GNOME ftp site, and it's
not there either. 
It's my first project with gtkmm so it's possible that I missed
something. Or it is yet to be added...?

Marko Anastasov