title: Controls FX TraversalEngine Error
body: <p>I installed <code>JDK8u20</code> and tried to run my program with the <code>ControlsFX</code> library in it.</p>
  
  <p>This should work fine, but if I call a method from controlsFX, I get the following exception</p>
  
  <p><strong>Method</strong></p>
  
  <pre><code> private void showError(final String msg) {
          Platform.runLater(new Runnable() {
              @Override
              public void run() {
                  Dialogs.create().title("Achtung").message(msg).showError();
              }
          });
      }
  </code></pre>
  
  <p><strong>Exception</strong></p>
  
  <pre><code>java.lang.NoSuchMethodError: com.sun.javafx.scene.traversal.TraversalEngine.&lt;init&gt;(Ljavafx/scene/Parent;Z)V
      at org.controlsfx.control.ButtonBar$2.&lt;init&gt;(ButtonBar.java:412)
      at org.controlsfx.control.ButtonBar.&lt;init&gt;(ButtonBar.java:412)
      at org.controlsfx.control.ButtonBar.&lt;init&gt;(ButtonBar.java:355)
      at org.controlsfx.dialog.Dialog.createButtonPanel(Dialog.java:1034)
      at org.controlsfx.dialog.Dialog.createCenterPanel(Dialog.java:1029)
      at org.controlsfx.dialog.Dialog.buildDialogContent(Dialog.java:950)
      at org.controlsfx.dialog.Dialog.show(Dialog.java:320)
      at org.controlsfx.dialog.Dialogs.showSimpleContentDialog(Dialogs.java:1106)
      at org.controlsfx.dialog.Dialogs.showError(Dialogs.java:555)
      at ch.berufsbildungscenter.notiztool.gui.control.LoginController$3.run(LoginController.java:93)
      at com.sun.javafx.application.PlatformImpl.lambda$null$164(Unknown Source)
      at com.sun.javafx.application.PlatformImpl$$Lambda$48/1171794308.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(Unknown Source)
      at com.sun.javafx.application.PlatformImpl$$Lambda$47/1875594551.run(Unknown Source)
      at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
      at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
      at com.sun.glass.ui.win.WinApplication.lambda$null$141(Unknown Source)
      at com.sun.glass.ui.win.WinApplication$$Lambda$38/994750745.run(Unknown Source)
      at java.lang.Thread.run(Unknown Source)
  </code></pre>