Glen D;
Yeah, more documentation will be great. However, I can tell you that eventually you will (kind of) understand what is going on. Don't ask me how, I guess is experience.
In the meantime, usually what I do is that I change the property to "Read", create an indicator and run the VI to see what's going on. Sometimes by just creating the indicator you can tell what is its purpose. Also, each element in the cluster may be documented.
In your specific case, I
think can be properties like type (arrow, selection, busy, etc.).
I hope this help.
Regards;
Enrique
www.visecurity.com
www.vartortech.com