Refresh: Refresh the selection list. This may be necessary when multiple users are accessing a project, or you are working in multiple applications in the same project at one time.

Select All: Select all of the items in the list.

Invert Selection: Select all of the items in the list that aren't currently selected, and deselect all of the items that are currently selected.

Set Displayed Tops: Open the Set Displayed Tops dialog box.