If you right-click an element on the Pending Elements list, a pop-up menu appears that lists the following three selections: Remove, Rediscovery, and Show Discovery Time.
Select Remove to remove the selected element from the Pending Elements list.
Select Rediscovery to initiate an immediate discovery of the selected element.
Select Show Discovery Time to view the last time that the selected element was discovered. If Show Discovery Time is unavailable (dimmed), the element has yet to be discovered.