I see that. I tried rewriting the list using Tk::MListbox in my app. Whenever the sort functionality is used, it leaks about 20KB of memory. Just so I understand, with Tk::Hlist, you can't bind a sort function to the column, right? I don't really want to clutter things up with buttons, unless I have to. Is there any way to work around this memory problem? Your post had mentioned -reconfigure...