matplotlib/matplotlib — pull request #1285 by cgohlke (2012-09-20 07:04:43+00:00)
Title: Hide Tk root window until later

On Windows, when using the tkagg backend with mpl 1.2.0rc2, before a figure window is displayed, a small, empty window is shown for a short amount of time.
This becomes annoying.
I'm not sure this is the correct fix, but it works for me on Python 2.6 to 3.3.