def set_focus(self, widget):
if widget == self.frm('entry2'):
widget.set_text(Format.fecha(widget.get_text()))
if widget == self.frm('entry4'):
self.cargar_proveedor()
if widget == self.frm('entry1'):
widget.set_text(Format.factura(widget.get_text()))
if widget == self.frm('entry9'):
self.cargar_articulos()
widget.get_toplevel().child_focus(Gtk.DirectionType.TAB_FORWARD)
if widget == self.frm('entry12'):
self.guardar()
