All of the current built-in themes use the "-sashthickness"
element option for this. In Tk 8.5/Tile 0.8.2, this is
set on the "Sash" style, not the "TPanedwindow" style.
See also SF#1898288 [1] for more details.
[1] <URL: http://sourceforge.net/support/tracker.php?aid=1898288 >
--je
Just tried it with 8.5.2 with a thickness all the way down to 1 and oh
yeah, that works perfectly! =)
Thanks Joe!