Inheritance: System.EventArgs
 void rule_RemoveRule(object sender, RemoveRuleEventArgs e)
 {
     e.Rule.RemoveRule -= rule_RemoveRule;
     Rules.Remove(e.Rule);
 }
 void rule_RemoveRule(object sender, NotifierCore.Notifier.Event.RemoveRuleEventArgs e)
 {
     e.Rule.RemoveRule -= new EventHandler <NotifierCore.Notifier.Event.RemoveRuleEventArgs>(rule_RemoveRule);
     Rules.Remove(e.Rule);
 }