While not an immediate solution to your question, I might direct you to have a look at an alternate GUI development tool for Perl which works quite well with MacOS - wxPerl, a wrapper for the wxWindows GUI toolkit.

This toolkit has gathered a great deal of support of late and a number of resources exist for its usage including:

• http://wxperl.sourceforge.net/
• http://www.wxwindows.org/
• http://www.perl.com/pub/a/2001/09/12/wxtutorial1.html
• http://www.perlmonks.org/index.pl?node_id=112297
• http://www.perlmonks.org/index.pl?node_id=112816
• http://www.perlmonks.org/index.pl?node_id=122227