# guiObject.py
from tkinter import *

class AWindowDemo:
  def __init__(self, rootWin):
      #Create a label and button to put in the root window!
      self.button = Button(rootWin, text="Click Me!", command= self.doit)
      self.button.pack()

      self.ourRoot = rootWin   #Save a reference to the rootWin
                               #which will be used by the doit method!


  def doit(self):
     print("Button was clicked!")
     self.button.config(fg="red")     #Change the button!
     l = Label(self.ourRoot, text="You clicked!")
     l.pack()



#Create the main root window, instantiate the object, and run the main loop!
rootWin = Tk()
app = AWindowDemo( rootWin )
rootWin.mainloop()