How to edit ttk style for ttk.OptionMenu
<p>Recently started using ttk for improving my GUI looks, but i got stuck at editing ttk.OptionMenu style. As I uderstand code below should change background of all Radiobuttons and OptionMenus. For Radiobutton (and other elements I tried) it works just fine, but OptionMenu doesnt change at all.</p>

<pre><code>s = ttk.Style()
s.configure("TRadiobutton", background="grey")
s.configure("TOptionMenu", background="grey")
</code></pre>