title: How to show a window that was hidden using "withdraw" method?
body: <p>I would like to show a window after I called <code>withdraw</code>. </p>
  
  <p>The following is my current code:</p>
  
  <pre><code>from Tkinter import *
  
  def callback():    
      global root
      root.withdraw()
      win2 = Tk()
  
  root = Tk()
  Label(root,text='this is a window').pack()
  Button(root,text='withdraw',command=self.callback).pack()
  mainloop()
  </code></pre>
  
  <p>As soon as I press the button, the window disappears much as I want it, and another window appears and everything works great. How do I get the first window back, in the same state as it was before?</p>