I think it depends on your version of Tcl, http://wiki.tcl.tk/11075
The following instructions are for the Tile package, not for the ttk included in Tk 8.5. There are subtle differences, such as tile::setTheme becoming ttk::setTheme and others.
So for Tcl 8.5 I usually needed 
use Tkx;
$Tkx::TRACE=64;
Tkx::package_require('tile');
Tkx::ttk__setTheme('xpnative');#Tkx::tile__setTheme('xpnative');

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Your code however works fine with Tcl 8.5

In reply to Re: Tkx ttk problem by Anonymous Monk
in thread Tkx ttk problem by igoryonya

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