Wireshark-users: [Wireshark-users] How to specify second files for capture comparison

All:

I'm using Win32 version 1.2.1 (SVN 29141).   I'm having trouble using the Compare two capture files feature  (Statistics > Compare).   I may be a dolt, but I don't see how to specify second file.    The help document appears not yet to document this feature.  I've tried searching the wiki, but came up empty.

Can someone clue me in?


Thanks!

d.