tkinter: native look to windows?

[John Salerno]

I'm a little confused. I was under the impression (perhaps incorrectly) 
that Tkinter will create GUI widgets that are native to your OS, so I 
should have an XPish looking application. But when I create buttons (and 
even the text fields look a bit different), they are not the 'fancy' 
Windows buttons that are rectangular with rounded edges and have a 
blueish border around the active button, but instead are just square 
buttons. Is this normal behavior? Why don't I get the XP type of 
buttons, and is it possible to get them?