Where Used view
You can see all the locations in a map source (.mms) file where a particular map is called in rules, where a particular type is used in rules, or where the maps and types are used by a rule, in the Where Used view.
Open the Where Used view by right-clicking a map in the Outline view, or a type in the Map editor, and selecting Where Used.
From the Where Used view, you can go directly to the location where the map source file references the type or the map in a rule by double-clicking any of the locations returned in the view.