title: GWT Drop Down Menu with images
body: <p>I want to make a drop down menu with images. This means:</p>
  
  <pre><code> ImageListName
    image.png
    image1.png
    ......
    imageN.png
  </code></pre>
  
  <p>There should be only images no text and I want to select on image like when you can choose an avatar. 
  I'm not sure which approach is the best. </p>