function prop_clicked($button, $ptr_entry)
{
$dialog = new GtkDialog('Escolha uma data ...');
$pixbuf = $dialog->render_icon(Gtk::STOCK_PROPERTIES, Gtk::ICON_SIZE_BUTTON);
$dialog->set_icon($pixbuf);
$dialog->vbox->pack_start($calendar = new GtkCalendar());
$calendar->connect('day-selected-double-click', array($this, 'calendar_double_click'), $dialog, $ptr_entry);
$calendar->show();
$dialog->run();
$dialog->destroy();
}