connecting to signal_focus_out_event with additional parameters

[Bob Caryl <bob fis-cal com>]

Hi guys,

I'm trying to connect to Gtk::Entry::signal_focus_out_event() so that I 
can vet the contents of the Gtk::Entry when it loses focus.  I tried 
doing it the normal way:

myentry->signal_focus_out_event().connect(sigc::mem_fun(*this,&MyClass::on_entry_focus_out))

where on_entry_focus_out is prototyped thus:

bool MyClass::on_entry_focus_out(GdkEventFocus *focus);

My problem is that the GdkEventFocus::window member is merely a pointer 
to a GdkWindow drawable (and I also tried casting the result of 
gdk_parent_window(focus->window) to a Gtk::Entry * and it still caused a 
seg fault when run), and doesn't give me access to my Gtk::Entry from 
which the connection was originally made, so I tried doing this:

myentry->signal_focus_out_event().connect(sigc::bind<Gtk::Entry 
*>(sigc::mem_fun(*this,&MyClass::on_entry_focus_out),myentry));

where on_entry_focus out is prototyped thus:

bool MyClass::on_entry_focus_out(GdkEventFocus *focus,Gtk::Entry *entry);

This construct compiles, but the linker has big problems with it.

Can someone point to me a URL that will illustrate the error of my 
ways?  I really didn't want to do this at all, but my boss insists on 
this idiot-proofing vetting process for the data entered here.

Thanks,

Bob Caryl