>>How Remove(-1) clear the collection Class is not described anywhere.
>
>This is incorrect.
>
>From the VFP help file, topic "Remove method (Collection class)":
>(NOTE: Bold type has been added for clarification)
>
>Parameters
>eIndex
>
>Specifies an expression that represents a position of an item in the collection. This expression can be one of two types:
>Numeric. The eIndex expression must have a value from 1 to the value of the Count property for the collection. If you pass a value of -1, Visual FoxPro removes all items in the collection in descending index order.
>String. The eIndex expression must correspond to the cKey that was specified for the item when it was added to the collection.
>
>If eIndex does not match an existing member of the collection, an error occurs.