title: onPressed create multiple instances of CheckboxListTile in Flutter
body: <p>I'm new to flutter so I'm not sure how to go about this. I want to be able to add another instance of the same CheckboxListTile when a user presses a button right below the most recent CheckboxListTile.</p>
  <p>The code for how it currently is is below.</p>
  <pre><code>Widget build(BuildContext context) {
  return ListView(
    children: &lt;Widget&gt;[
      CheckboxListTile(
          title: TextField(
            autocorrect: true,
          ),
          value: checkBoxValue,
          secondary: Icon(Icons.assignment),
          onChanged: (bool newValue) {
            setState(() {
              checkBoxValue = newValue;
            });
          }
      ),
    ],
  </code></pre>
  <p>The code of an example of how I would want the app to appear after a user presses is below.</p>
  <pre><code>Widget build(BuildContext context) {
  return ListView(
    children: &lt;Widget&gt;[
      CheckboxListTile(
          title: TextField(
            autocorrect: true,
          ),
          value: checkBoxValue,
          secondary: Icon(Icons.assignment),
          onChanged: (bool newValue) {
            setState(() {
              checkBoxValue = newValue;
            });
          }
      ),
      CheckboxListTile(
          title: TextField(
            autocorrect: true,
          ),
          value: checkBoxValue,
          secondary: Icon(Icons.assignment),
          onChanged: (bool newValue) {
            setState(() {
              checkBoxValue = newValue;
            });
          }
      ),
    ],
  </code></pre>
  <p>Thanks in advance!</p>