GTK Action Handler

[dhk <dhkuhl optonline net>]

What is the callback signature suppose to look like for a GTK Action
handler?

I have a menu made from a GtkBuilder UI definition.  The GtkActionEntry
array sets the callbacks for the menu item; however, what is the
callback suppose to look like?  Some menu items I want to call a button
clicked callback which seems to work and another I want to call an
expander activated callback which doesn't seem to work.  In addition, it
looks like the first parameter of the callback should be a GtkAction
value, so I'm not sure why the button callback works when the expander
callback doesn't.

Thanks,

dhk