title: onChange event for Google Maps APIv3 drawing manager
body: <p>I'm using the GMaps API v 3 <a href="https://developers.google.com/maps/documentation/javascript/reference#DrawingManager" rel="nofollow noreferrer">Drawing Manager</a> to let users draw shapes on a map. </p>
  
  <p>I can use the <code>complete</code> events to trigger actions when a shape is added to the map (eg. <code>overlaycomplete</code> or <code>polygoncomplete</code>)-- but I am also allowing the user to edit the completed shapes. </p>
  
  <p>Is there a way to trigger an action when a shape is changed? I can't see any way to fire another function when a shape is modified.</p>