title: Form validator message
body: <p>I'm looking for form validator similar to these examples:</p>
  
  <p><img src="https://i.stack.imgur.com/6fZgf.png" alt="enter image description here"></p>
  
  <p>or</p>
  
  <p><img src="https://i.stack.imgur.com/CrTq8.jpg" alt="enter image description here"></p>
  
  <p>Is this custom JavaFX component or this can be done using standard JavaFX?</p>
  
  <p>Is there any example how I can create form validator similar to these?</p>