private void CreateTempRuleNotifyIcon(CustomRule newRule)
        {
            if (!tempRules_.Contains(newRule))
            {
                tempRules_.Add(newRule);
            }
            if (tempNotifyIcon_ is null)
            {
                // tray icon for temporary rule
                WinForms::NotifyIcon ni = new WinForms::NotifyIcon();
                ni.Click += iconClick;
                // shown in message center on win10
                ni.BalloonTipIcon  = WinForms::ToolTipIcon.Info;
                ni.BalloonTipTitle = Common.Properties.Resources.RULE_TEMP_TITLE;
                ni.BalloonTipText  = Messages.RULE_TEMP_DESCRIPTION;
                // tooltip shown on tray icon
                ni.Text    = Messages.RULE_TEMP_DESCRIPTION_SHORT; // limit 64 chars on win10
                ni.Icon    = new Icon(SystemIcons.Shield, new System.Drawing.Size(16, 16));
                ni.Visible = true;
                ni.ShowBalloonTip(2000);
                ni.Visible = true;

                tempNotifyIcon_ = ni;
            }
        }
        private void CreateTempRuleNotifyIcon(CustomRule newRule)
        {
            if (!tempRules_.Contains(newRule))
            {
                tempRules_.Add(newRule);
            }
            if (tempNotifyIcon_ is null)
            {
                void iconClick(object sender, EventArgs e)
                {
                    if (!RemoveTempRulesAndNotfyIcon())
                    {
                        WinForms::MessageBox.Show(Messages.MSG_RULE_RM_FAILED, Messages.MSG_DLG_ERR_TITLE, WinForms::MessageBoxButtons.OK, WinForms::MessageBoxIcon.Error);
                    }
                }

                // tray icon for temporary rule
                WinForms::NotifyIcon ni = new WinForms::NotifyIcon();
                ni.Click += new EventHandler(iconClick);
                // shown in message center on win10
                ni.BalloonTipIcon  = WinForms::ToolTipIcon.Info;
                ni.BalloonTipTitle = Common.Properties.Resources.RULE_TEMP_TITLE;
                ni.BalloonTipText  = Messages.RULE_TEMP_DESCRIPTION;
                // tooltip shown on tray icon
                ni.Text    = Messages.RULE_TEMP_DESCRIPTION_SHORT; // limit 64 chars on win10
                ni.Icon    = new Icon(SystemIcons.Shield, new System.Drawing.Size(16, 16));
                ni.Visible = true;
                ni.ShowBalloonTip(2000);
                ni.Visible = true;

                tempNotifyIcon_ = ni;
            }
        }