title: Can I add listener to Circle drawn on the map?
body: <p>I want to draw a <code>Circle</code> on the map and do something when the user touches it. Also, I can't find any method of <code>Circle</code> which is about that. What do I need to do?</p>
  
  <p>Thanks,
  Sarun</p>
  
  <p><strong>Edit</strong></p>
  
  <p>In order to clarify my question. I want the circle that is have the constant distance relative to the ground, that means, if I zoom the map, the circle will grow bigger.</p>