[Vala] Detailed signals

[Erick Pérez Castellanos <erick red gmail com>]

Hi:

How can I connect to a detailed signal, eg: 'changed::x' as you can see in
the GSettings Devhelp code:
-------------sample-------------------
The "changed" signal
   void user_function (GSettings *settings, gchar *key, gpointer user_data)
: Run Last / Has Details

The "changed" signal is emitted when a key has potentially changed. You
should call one of the g_settings_get() calls to check the new value. This
signal supports detailed connections. You can connect to the detailed signal
"changed::x" in order to only receive callbacks when key "x" changes.
settings : the object on which the signal was emitted key : the name of the
key that changed user_data : user data set when the signal handler was
connected.
-------------sample-------------------

I tried the obvious object.changed::x.connect(...); and clearly didn't work.
So help please...
Thxs