title: JavaFX8 -fx-background-image doesn't work
body: <p>I want to set background image of root-pane. For this purpose, I add this inline style to root-pane.</p>
  
  <pre><code>-fx-background-image: url("image.png");
  </code></pre>
  
  <p>Image is in same directory as FXML file. I checked path at least 10 times.
  Can somebody say, what's wrong?</p>