diff -r 6ae997057419 modules/controls/src/main/java/com/sun/javafx/scene/control/skin/ComboBoxBaseSkin.java
--- a/modules/controls/src/main/java/com/sun/javafx/scene/control/skin/ComboBoxBaseSkin.java	Thu May 22 17:19:09 2014 +0200
+++ b/modules/controls/src/main/java/com/sun/javafx/scene/control/skin/ComboBoxBaseSkin.java	Tue May 27 07:36:59 2014 +0200
@@ -146,8 +146,10 @@
         }
 
         if (displayNode != null && !children.contains(displayNode)) {
+            displayNode.setManaged(false);
             children.add(displayNode);
             displayNode.applyCss();
+            displayNode.setManaged(true);
         }
     }