g_object_ref(gTooltipWidget); gtk_object_sink(GTK_OBJECT(gTooltipWidget));
ensure_tooltip_widget(){    if (!gTooltipWidget) {        gTooltipWidget = gtk_tooltips_new();        gtk_tooltips_force_window(gTooltipWidget);        gtk_widget_set_rc_style(gTooltipWidget->tip_window);        gtk_widget_realize(gTooltipWidget->tip_window);    }    return MOZ_GTK_SUCCESS;}