protected void Unsubscribe() { EventCommands.Unsubscribe(this); }
protected void Unsubscribe(EventCommand command) { EventCommands.Unsubscribe(this, command); }
protected void Unsubscribe() { EventCommands.Unsubscribe(this); }
protected void Unsubscribe(EventCommand command) { EventCommands.Unsubscribe(this, command); }