title: Unable to change frame color once created
body: <p>In the code below, app is an instance of mainWindow, which inherits from Tkinter.Frame. I am trying to use the Frame.Configure method to change the background color of the Frame.However, calling  self.configure(background="yellow") doesn't work. Can someone help me understand what mistake I am making?</p>
  
  <pre><code>import Tkinter
  
  
  class mainWindow(Tkinter.Frame):
      def __init__(self, parent):
          Tkinter.Frame.__init__(self, master=parent)
          self.parent=parent
          self.button1=Tkinter.Button(master=self.parent, text='ONE', command=self.change)
          self.button1.pack()
          self.pack()
  
      def change(self):
          self.parent.wm_title("Changed")
          self.configure(background="yellow")
  
  
  root = Tkinter.Tk()
  root.geometry("600x600+50+50")
  app=mainWindow(root)
  root.mainloop()
  </code></pre>