title: How can I set the mac osx default button in tkinter
body: <p>I am using TkInter to develop a simple application for Mac OSX in python.</p>
  
  <p>I am wondering how to set the 'default button' for a dialog in tkinter. See the <a href="http://developer.apple.com/library/mac/#documentation/userexperience/conceptual/applehiguidelines/Windows/Windows.html#//apple_ref/doc/uid/20000961-BABCAJID" rel="nofollow">human interface guidelines</a> to see what this means.</p>
  
  <p>Is this even possible?</p>