.SubCollection (gb.db)
This virtual class is the parent class of every collection of sub-objects.
It is only intended for internal use inside native components.
This class is virtual.
This class is not creatable.
This class acts like a 
read-only array.
This class is 
enumerable with the 
FOR EACH keyword.
| Count | Returns the number of elements in the collection of sub-objects. | 
Methods
| Exist | Returns if a specified element exists in the collection of sub-objects. | 
| Refresh | Refreshes the collection contents by clearing its internal cache. |