Gets the position within the group to which the link is about to be or has been dropped.
An integer value specifying the zero-based target link index.
This property value can vary from 0 to the number of links within the target group. If it is 0, the link is about to be or has been inserted into the first position within the links collection. If it is equal to the number of links within the target group, it is added to the end of the collection.