title: Matplotlib "pick_event" not working in embedded graph with FigureCanvasTkAgg
body: <p>I'm trying to handle some events to perform user interactions with embedded subplots into a Tkinter frame. Like in this <a href="http://matplotlib.org/examples/user_interfaces/embedding_in_tk.html" rel="noreferrer">example</a></p>
  
  <p>Works fine with "key_press_event" and "button_press_event", but does not work with "pick_event".</p>
  
  <p>I modified that example from the link, just adding the following piece of code after the <code>mpl_connect</code> calling:</p>
  
  <pre><code>def on_button_press(event):
      print('you pressed mouse button')
  
  canvas.mpl_connect('button_press_event', on_button_press)
  
  def on_pick(event):
      print('you picked:',event.artist)
  
  canvas.mpl_connect('pick_event', on_pick)
  </code></pre>
  
  <p>Why "pick_event" doesn't work into embedded graphs? And how do get it to work?</p>
  
  <p>My configurations detailed:</p>
  
  <ul>
  <li>Windows 10</li>
  <li>Python 3.5 (conda version)</li>
  <li>Matplotlib 1.5.3 installed via pip</li>
  </ul>
  
  <p>Thanks in advance!</p>