title: Activate or deactivate button with CheckButton
body: <p>I created this program, but I would like the button "button" (first part) 
  to be deactivated if we don't select checkButton (second part). So I would like to activate the button only if CheckButton is selected.</p>
  
  <pre><code>acceptButton = IntVar()
  case = Checkbutton(fenetre, text="I accept the agreement", variable=acceptButton, cursor="hand2", bg="white",)
  case.pack()
  var = case.select() == 1
  
  doNotButton = IntVar()
  case2 = Checkbutton(fenetre, text="I do not accept the agreement", variable=doNotButton, bg="white", state=DISABLED) #il est impossible de cocher cette case
  case2.pack()
  </code></pre>
  
  <p>the button:</p>
  
  <pre><code>button = Button(fenetre, text="Suivant", command=commandSuiv, cursor="hand2", height=1, width = 15) #taille
  button.pack()
  button.place(x=c, y=d)
  button.configure(font=f)
  </code></pre>
  
  <p>Thank you so much
  :)</p>