void DnsServersAdd()
        {
            WindowPreferencesIpController.Ip = "";
            WindowPreferencesIpController dlg = new WindowPreferencesIpController();

            dlg.Window.ReleasedWhenClosed = true;
            NSApplication.SharedApplication.RunModalForWindow(dlg.Window);
            dlg.Window.Close();

            if (dlg.Accepted)
            {
                TableDnsServersController.Add(WindowPreferencesIpController.Ip);
                TableDnsServersController.RefreshUI();
            }

            this.EnableIde();
        }