title: tkinter clicks on child do not propagate to parent
body: <p>Why doesn't clicking on a child element propagate to the parent?</p>
  
  <pre><code>from tkinter import *
  
  root = Tk()
  
  def handler(event):
      print('clicked at', event.x, event.y)
  
  frame = Frame(root, width=100, height=100)
  label = Label(frame, text="Label")
  frame.bind('&lt;Button-1&gt;', handler)
  frame.pack()
  label.pack(side=TOP)
  
  root.mainloop()
  </code></pre>
  
  <p>When I run that, clicking on the label doesn't fire the handler.  I've understood that events propagate to parents by default and if you didn't want that, you'd have to return "break"</p>