dropbox remove -- removes an item from a dropbox.
DROPBOX REMOVE DropBox$, Position
Removes item number Position.
Note: If the removed item was marked, the item before it will be marked instead. You will NOT get
a message that the marked item has changed. If the first item will be deleted, the next item in
the drop box will be marked.
Each time an item was removed, the drop box count will change as well!
dropbox , dropbox add, dropbox clear, dropbox count, dropbox get$, dropbox select