title: Python easygui , global name 'Tk' is not defined
body: <p>I am trying to execute the following code snippet:</p>
  
  <pre><code>import easygui
  from Tkinter import *
  easygui.msgbox('Hello')
  </code></pre>
  
  <p>but it returns the following error:</p>
  
  <pre><code>NameError                                 Traceback (most recent call last)
  &lt;ipython-input-35-28d6ffa54e48&gt; in &lt;module&gt;()
  ----&gt; 1 easygui.msgbox('Hello')
  
  /usr/local/lib/python2.7/dist-packages/easygui/boxes/derived_boxes.pyc in msgbox(msg, title, ok_button, image, root)
      214                         root=root,
      215                         default_choice=ok_button,
  --&gt; 216                         cancel_choice=ok_button)
      217 
      218 
  
  /usr/local/lib/python2.7/dist-packages/easygui/boxes/base_boxes.pyc in buttonbox(msg, title, choices, image, root, default_choice, cancel_choice)
       64         boxRoot.withdraw()
       65     else:
  ---&gt; 66         boxRoot = Tk()
       67         boxRoot.withdraw()
       68 
  
  NameError: global name 'Tk' is not defined 
  </code></pre>
  
  <p>I tried troubleshooting with various combinations of importing Tkinter -   </p>
  
  <pre><code>import Tkinter as Tk  
  import Tkinter
  from Tkinter import *
  </code></pre>
  
  <p>but none of them work. I have the latest version of both packages installed. What is wrong?</p>