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Some of the dialogs in Tkinter don't correctly show buttons in newer versions of Windows (XP, Vista, 7). Instead, they use square Win2000-and-before-type buttons. Here's some Python 2.7 code that illustrates this:
import tkMessageBox
tkMessageBox.showinfo()
import tkColorChooser
tkColorChooser.askcolor()
I attached a screenshot as well, illustrating what is meant by "ugly buttons."
I'm not sure if this is on the Tk or Tkinter side, but since the rest of Tkinter uses new-style buttons, these few objects should too (as far as I'm aware, these are the only objects that exhibit this behavior.