Hi Densingh Daniel
I would recommend you to avoid using Dropdowntags in most cases. I say this from experience.
Multiple times I've stubbornly tried to add Dropdowntags - user experience is really neet on this widget - on different projects only to come and find out certain misbehaviours on reloading the widget, after manipulating the DropdownItem List. Most of the times I had to create something on my own to replicate the user experience. I didn't find anything on Forge also.
Anyway, good luck!