Tray icon not being removed

Per default, SmartFTP does allow to have more than one instance of it. If you disable it and try to open a new instance, the current instance is being focussed. If SmartFTP is in tray, the tray icon is not removed whereas it's being removed if you double click the tray-icon.

Expected behavoir is that the icon is being removed also when i try to open a new instance.