title: set Icon on Polygon corners in google map api 3
body: <p>I have a polygon which is editable so when i start to edit it it shows small icon on it.<br>
  Below in picture an arrow icon (for undo changes).</p>
  
  <p><img src="https://i.stack.imgur.com/8TF25.png" alt="enter image description here">  </p>
  
  <p>so i want to add another icon by my own so user can delete that polygon by clicking on it. So ho to add icon there?</p>
  
  <p><strong>Update</strong>
  Here is what i do so far
  <a href="http://jsfiddle.net/BluAngel/Lerwytuk/7/" rel="nofollow noreferrer"><code>Link</code></a>
  Now i just want to add icon when polygon complete event fired.</p>