RT-28393: Left / Right key navigation for Menu dropdowns don't work. 

diff -r 5e8a8d2136eb modules/controls/src/main/java/com/sun/javafx/scene/control/skin/ContextMenuContent.java
--- a/modules/controls/src/main/java/com/sun/javafx/scene/control/skin/ContextMenuContent.java	Fri Nov 01 17:15:43 2013 -0700
+++ b/modules/controls/src/main/java/com/sun/javafx/scene/control/skin/ContextMenuContent.java	Tue Nov 05 14:17:26 2013 -0800
@@ -52,6 +52,7 @@
 import javafx.geometry.Side;
 import javafx.geometry.VPos;
 import javafx.scene.Node;
+import javafx.scene.Parent;
 import javafx.scene.control.CheckMenuItem;
 import javafx.scene.control.ContextMenu;
 import javafx.scene.control.Label;
@@ -564,6 +565,26 @@
                     default:
                         break;
                 }
+
+                if (!ke.isConsumed()) {
+                    Node ownerNode = contextMenu.getOwnerNode();
+                    if (ownerNode instanceof MenuItemContainer) {
+                        // Forward to parent menu
+                        Parent parent = ownerNode.getParent();
+                        while (parent != null && !(parent instanceof ContextMenuContent)) {
+                            parent = parent.getParent();
+                        }
+                        if (parent instanceof ContextMenuContent) {
+                            ((ContextMenuContent)parent).getOnKeyPressed().handle(ke);
+                        }
+                    } else if (ownerNode instanceof MenuBarSkin.MenuBarButton) {
+                        // This is a top-level MenuBar Menu, so forward event to MenuBar
+                        MenuBarSkin mbs = ((MenuBarSkin.MenuBarButton)ownerNode).getMenuBarSkin();
+                        if (mbs != null && mbs.getKeyEventHandler() != null) {
+                            mbs.getKeyEventHandler().handle(ke);
+                        }
+                    }
+                }
             }
         });
 
diff -r 5e8a8d2136eb modules/controls/src/main/java/com/sun/javafx/scene/control/skin/MenuBarSkin.java
--- a/modules/controls/src/main/java/com/sun/javafx/scene/control/skin/MenuBarSkin.java	Fri Nov 01 17:15:43 2013 -0700
+++ b/modules/controls/src/main/java/com/sun/javafx/scene/control/skin/MenuBarSkin.java	Tue Nov 05 14:17:26 2013 -0800
@@ -175,6 +175,10 @@
     private EventHandler<MouseEvent> mouseEventHandler;
     private ChangeListener<Boolean> menuBarFocusedPropertyListener;
     
+    EventHandler<KeyEvent> getKeyEventHandler() {
+        return keyEventHandler;
+    }
+
     /***************************************************************************
      *                                                                         *
      * Constructors                                                            *
@@ -578,7 +582,7 @@
         getSkinnable().focusedProperty().addListener(menuBarFocusedPropertyListener);
         for (final Menu menu : getSkinnable().getMenus()) {
             if (!menu.isVisible()) continue;
-            final MenuBarButton menuButton = new MenuBarButton(menu.getText(), menu.getGraphic());
+            final MenuBarButton menuButton = new MenuBarButton(this, menu.getText(), menu.getGraphic());
             menuButton.setFocusTraversable(false);
             menuButton.getStyleClass().add("menu");
             menuButton.setStyle(menu.getStyle()); // copy style
@@ -619,6 +623,7 @@
                 public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
                     if (menu.isShowing()) {
                         menuButton.show();
+                        focusedMenuIndex = container.getChildren().indexOf(menuButton);
                     } else {
                         menuButton.hide();
                     }
@@ -916,18 +921,16 @@
 
     static class MenuBarButton extends MenuButton {
         private ChangeListener<Boolean> menuListener;
+        private MenuBarSkin menuBarSkin;
         private Menu menu;
 
-        public MenuBarButton() {
-            super();
+        public MenuBarButton(MenuBarSkin menuBarSkin, String text, Node graphic) {
+            super(text, graphic);
+            this.menuBarSkin = menuBarSkin;
         }
 
-        public MenuBarButton(String text) {
-            super(text);
-        }
-
-        public MenuBarButton(String text, Node graphic) {
-            super(text, graphic);
+        public MenuBarSkin getMenuBarSkin() {
+            return menuBarSkin;
         }
 
         private void clearHover() {