A String expression that specifies the key of the Aggregate object to be
removed. No error is returned if no Aggregate with specified key is found.
Use the Remove method to remove an individual Aggregate
object from the Aggregates collection. The Clear
method removes all elements in the Aggregates collection. The Item
property of the Aggregates collection accesses an Aggregate object giving its
key. The Count property of the Aggregates
collection counts the number of Aggregate objects in the Aggregates
collection.