modules/graphics/src/main/java/javafx/scene/layout/Pane.java

@@ -23,10 +23,11 @@
  * questions.
  */
 
 package javafx.scene.layout;
 
+import com.sun.javafx.scene.layout.PaneHelper;
 import javafx.beans.DefaultProperty;
 import javafx.collections.ObservableList;
 import javafx.scene.Node;
 
 /**

@@ -93,10 +94,14 @@
  *
  * @since JavaFX 2.0
  */
 @DefaultProperty("children")
 public class Pane extends Region {
+    static {
+        PaneHelper.setPaneAccessor(new PaneHelper.PaneAccessor() {
+        });
+    }
 
     static void setConstraint(Node node, Object key, Object value) {
         if (value == null) {
             node.getProperties().remove(key);
         } else {

@@ -115,10 +120,14 @@
             }
         }
         return null;
     }
 
+    {
+        // To initialize the class helper at the begining each constructor of this class
+        PaneHelper.initHelper(this);
+    }
     /**
      * Creates a Pane layout.
      */
     public Pane() {
         super();