title: How to add an Image to a widget? Why is the image not displayed?
body: <p>How can I add an image to a widget in tkinter?</p>
  
  <p>Why when I use this code it does not work:</p>
  
  <pre><code>some_widget.config(image=PhotoImage(file="test.png"), compound=RIGHT)
  </code></pre>
  
  <p>but this does work?:</p>
  
  <pre><code>an_image=PhotoImage(file="test.png")
  some_widget.config(image=anImage, compound=RIGHT)
  </code></pre>