problem deleting derived widgets ...

[teratux <teratux gmail com>]

Hi ... I'm trying out an application that I want to create that uses a
glade file to load some widgets.  I noticed that when I use several
Dialogs in my application an I load'em all up when my app starts, my
memory usage sort of rises a little.  I want to manage my own dialog
creation and destruction rutines.  I tried doing a little example to see
if there really is no memory leakage involved in this and stumbled upon
a little problem.  

I tried with a basic widget ( no glade involved ):

Gtk::Dialog* dialog = 0;

while (1)
{
	dialog = new Gtk::Dialog();
	delete dialog;	
}

No problem here ....
Tried using a widget loaded from a glade file:

Glib::RefPtr<Gnome::Glade::Xml> refXml;
Gtk::Dialog* dialog = 0;

while (1)
{
	refXml = Gnome::Glade::Xml::create("glade.glade", "dialog1");
	refXml->get_widget( "dialog1", dialog );
	delete dialog;	
}

No problem here ...
But, when I use a derived widget ...

Glib::RefPtr<Gnome::Glade::Xml> refXml;
MyDialog* dialog = 0;

while (1)
{
	refXml = Gnome::Glade::Xml::create("glade.glade", "dialog1");
	refXml->get_widget_derived( "dialog1", dialog );
	delete dialog;	
}

Leakage all around ... I tried consulting the gtkmm documentation and
there's no say about memory management for derived widgets.  Even the
example with libglademm calls it's empty destructor like I do.

Can anyone help me??
Thanks ...