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I still think Python should include Tix. Here are some 
instructions on how to make Tix 8.1.4 work:

1. Unpack as a sibling of tcl8.4.1 and tk8.4.1
2. Edit win\common.mk, to set the following variables
    TCL_VER=8.4
    INSTALLDIR=<directory to pick up installation from later>
    MKDIR=mkdir
3. Edit win\makefile.vc, to set the following variables
    TOOLS32=<directory of cl>
    TOOLS32_rc=<directory of rc.exe>
4. Edit win\tk\pkgindex.tcl, to replace
    lappend dirs ../../Dlls
    with
    lappend dirs [file join [file dirname [info nameofexe]] Dlls]
5. nmake -f makefile.vc
6. nmake -f makefile.vc install
7. Copy INSTALLDIR\bin\tix8184.dll to <python>\DLLs
8. Optionally copy tix8184.lib somewhere
9. copy INSTALLDIR\lib\tix8.1 into <python>\tcl

With these instructions, invoking t.tk.eval("package require 
Tix") succeeds. For some reason, Tix won't still find any of 
the commands; I'll investigate this later.