title: JavaFX - How to delete a specific Node from an AnchorPane
body: <p>I'm using SceneBuilder 8.0.0 and JavaFX 8. <br/>
  I have a <code>Button btn</code> and a <code>Label lbl</code> attached to an <code>AnchorPane ap</code>. <br/>
  When the application starts, <code>btn</code> and <code>lbl</code> are attached to <code>ap</code>.</p>
  
  <blockquote>
    <p><strong>How can i delete one of these nodes ?</strong> (i only know clear() method which deletes all the nodes from <code>ap</code>).
    thanks.</p>
  </blockquote>