modules/controls/src/main/java/javafx/scene/control/skin/MenuButtonSkinBase.java

@@ -23,10 +23,11 @@
  * questions.
  */
 
 package javafx.scene.control.skin;
 
+import com.sun.javafx.scene.NodeHelper;
 import com.sun.javafx.scene.control.ContextMenuContent;
 import com.sun.javafx.scene.control.ControlAcceleratorSupport;
 import com.sun.javafx.scene.control.LabeledImpl;
 import com.sun.javafx.scene.control.skin.Utils;
 import javafx.application.Platform;

@@ -184,11 +185,11 @@
                 // Make sure button is in sync.
                 getSkinnable().hide();
             }
 
             if (popup.isShowing()) {
-                Utils.addMnemonics(popup, getSkinnable().getScene(), getSkinnable().impl_isShowMnemonics());
+                Utils.addMnemonics(popup, getSkinnable().getScene(), NodeHelper.isShowMnemonics(getSkinnable()));
             } else {
                 // we wrap this in a runLater so that mnemonics are not removed
                 // before all key events are fired (because KEY_PRESSED might have
                 // been used to hide the menu, but KEY_TYPED and KEY_RELEASED
                 // events are still to be fired, and shouldn't miss out on going