title: How can I insert icons in AppBar with Scenebuilder - JavaFX
body: <p>I'm trying to insert this icon into this AppBar object, but it refuse it accept it. Why? 
  The orginal template with the AppBar have an icon inserted from the beginning. But I want to learn how I can insert icon by my self from scratch.</p>
  
  <p><a href="https://i.stack.imgur.com/HJhlO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HJhlO.png" alt="enter image description here"></a></p>
  
  <p>Here is the orginal template:</p>
  
  <p><a href="https://i.stack.imgur.com/mjs9T.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mjs9T.png" alt="enter image description here"></a></p>