Unfortunately Media Center does not let you select forced subtitles from the list.
If subtitles are turned off, those hidden/forced tracks should be displayed, but I would prefer that they were shown in the list so you could see if the video even has a hidden/forced subtitle track.
There are three ways that non-English subtitles can be handled. (assume that the disc is English for these examples)
1. A separate hidden/forced subtitle track which only displays subtitles for non-English dialog.
2. A separate subtitle track in addition to the full English one, which only contains non-English dialog. This is not a hidden/forced track, and must be manually selected.
3. A full English subtitle track with BD-Java(?) options in the menu that will selectively enable/disable subtitles so that only the non-English parts are displayed by default.
Media Center can handle 1 & 2.
With 1, Media Center will show that subtitles are "off" which can be confusing - are subtitles off, or are they "off" and displaying a hidden track?
With 3 it is everything or nothing. Without full BD menu support, Media Center cannot selectively display only the non-English parts of the subtitle track.