The page you provided had dead links, but I found it at http://www.perlmonks.org/index.pl?displaytype=print;node_id=338291. It's dying with

Can't call method "get" on an undefined value at ztkdb14a.pl line 1715.

when I run it in the command window (on Windows 7.)

I'll start looking at it to see if I can learn what it has to teach me. Thanks!!!

Update: I got the window to open after moving the directory where admin privileges weren't required and creating admin.jpg and default.jpg in the thumbs directory. The HList looks like a one dimensional list but maybe it'll be clear how to extend it to multiple columns...

In reply to Re^4: Display new widgets after MainLoop by swe9
in thread Display new widgets after MainLoop by swe9

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