Maybe Tcl/Tk 8.5 will help? I know nothing about how/if it will get integrated with Perl, though, so might be a complete red herring.

http://www.tcl.tk/software/tcltk/8.5.html

From that page:

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Highlights of Tk 8.5 * New modern theming engine: New and complementary widgets that make use of platform-specific theming on Mac OS X and Windows to better fit in with those environments, and feature an improved look and feel under X11. (screenshots) * New widgets: Part of the themed widget set, Tk now has core notebook, combobox, treeview and progressbar widgets. * text widget: Smooth scrolling, widget peering, and improved procedures for counting and replacing text. * Font rendering: Now uses anti-aliased text under X11, and a more modern text engine (ATSUI) on Mac OS X. * Additional improvements: Window transparency, new fullscreen option for windows, enhancements to specific widgets and window layout, and more.