title: tkinter give window focus
body: <p>I have a tkinter python 2.x program.  I have several windows appearing on the screen.  I use buttons to navigate from one to another, but I'm struggling to close a window and refocus on a currently opened window.  I can open new windows just fine!</p>
  
  <pre><code>#code for main window
  def frmMain():
    app = Tk()
    app.title("TWS: XML Options")
    app.geometry("200x100")
    bn1 = Button(app,text="Add", command=frmAdd)
    bn1.grid(row = 2,column = 2, stick = W)
    bn2 = Button(app,text="Edit", command=frmEdit)
    bn2.grid(row = 2,column = 3, stick = W)
    bn3 = Button(app,text="Delete", command=frmDelete)
    bn3.grid(row = 2,column = 4, stick = W)
    bn4 = Button(app,text="Back",command=frmMenu)
    bn4.grid(row = 3,column = 2, stick = W)
    app.mainloop()
  
  #code for button on sub window
  ....
  bn1 = Button(app,text="Back", command=back)
  ...
  
  def back():
     #Code to close current window and reopen frmMain
  </code></pre>