Can I stop events for a while ??

[Sergio Trinidad <strinidadr gmail com>]

I have the next code

class miMaquina : public VBox
{
      Gtk:Label *lbl;
        .....

};
....
....

void miMaquina::on_size_allocate(Gtk::Allocation &alloc)
{
    int alto = 
alloc.get_height();
    int ancho = alloc.get_width();
    Gtk::VBox::on_size_allocate(alloc);

    Pango::FontDescription fd;
    fd.set_size((alto*Pango::SCALE));
    lbl->modify_font(fd);

}


The problem is that when the events ocurrs the lbl->modify_font(fd) activates 
a new on_size_allocate event, because the size of label changes with the size
of new text, and a infinite loop is launchet until X server gets an error. 
Can I stop signal emiting for a while, then apply 'lbl->modify_font' and later 
activate again the event??