title: Best way to create a flexible 3 box layout in JavaFX/FXML
body: <p>I want to create a flexible 3-box layout in JavaFX/FXML. A picture describes it the best, so just like in the following:</p>
  
  <p><img src="https://i.stack.imgur.com/KtZ1g.jpg" alt="preferred outcome"></p>
  
  <p>As you can see, the main part should consist of three resizable boxes. All of this boxes should have a preferred size. </p>
  
  <p>So the code looks like the following (simplified code).</p>
  
  <pre><code>&lt;BorderPane&gt;
    &lt;top&gt;
      &lt;VBox&gt;
        &lt;!-- menubar stuff --&gt;
      &lt;/VBox&gt;
    &lt;/top&gt;
    &lt;center&gt;
      &lt;!-- ACTUAL CONTENT HERE --&gt;
    &lt;/center&gt;
    &lt;bottom&gt;
      &lt;!-- toolbar stuff --&gt;
    &lt;/bottom&gt;
  &lt;/BorderPane&gt;
  </code></pre>
  
  <p>What could be the best approach here? Two nested <code>SplitPane</code>s?</p>