1. C-x C-f somefile.pl
2. M-x cperl-mode
3. Menu->Perl->Tools-Tags

   See the attached screenshot.  If you inspect VERY KEENLY the "Tags"
   menu is overlaid PERFECTLY on the top of it's grandparent.  

   The camouflaging is so perfect and I was confused why the submenu
   wasn't popping when "Tags" has arrow key next to it.

What should happen:
===================

Please stagger the sub-menus a bit.  The UI is very deceptive.