title: How to add an Onclick event to an image which is inside CircleAvatar Widget in flutter?
body: <p>I have a circular image inside circleAvatar on clicking which I want to open an alert dialog box.
  My question is how to add clicking event inside CircleAvatar?</p>
  
  <p>This is my code :</p>
  
  <pre><code>        Column(children: &lt;Widget&gt;[
          SizedBox(height: 32.0),
          CircleAvatar(
            radius: 55.0,
            backgroundImage: ExactAssetImage('assets/cat.jpg'),
          ),
          Container(
            height: 20.0,
          ),
          Text('01:29:30'),
          Text(
            'Avik Kumar Mandal',
            style: TextStyle(fontSize: 20),
          ),
  </code></pre>
  
  <p>Expected: onclick event on the image which is inside Circular avatar 
  P.s it is a profile picture on clicking which a dialog box should appear.</p>