[Ttk]'s [progressbar] [widget].
    :   http://www.tcl.tk/man/tcl8.5/TkCmd/ttk_progressbar.htm

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[D. McC] 2008 Mar 26: Can anyone here provide a quick tip on how to change the foreground color of the progressbar from the blah blue-gray default to a color of the programmer's choice?

[MG] I'm not 100% sure if this is the right way, but it seems to work for me when using the "alt" theme.
  ttk::style configure TProgressbar -background $color
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!!!!!!
%| [Category Widget] |%
!!!!!!