--- old/src/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2014-02-11 10:25:11.000000000 +0400
+++ new/src/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2014-02-11 10:25:11.000000000 +0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -61,8 +61,9 @@
     private static native void nativeSetNSWindowMinimizedIcon(long nsWindowPtr, long nsImage);
     private static native void nativeSetNSWindowRepresentedFilename(long nsWindowPtr, String representedFilename);
     private static native void nativeSetEnabled(long nsWindowPtr, boolean isEnabled);
-    private static native void nativeSynthesizeMouseEnteredExitedEvents(long nsWindowPtr);
+    private static native void nativeSynthesizeMouseEnteredExitedEvents();
     private static native void nativeDispose(long nsWindowPtr);
+    private static native CPlatformWindow nativeGetTopmostPlatformWindowUnderMouse();
 
     // Loger to report issues happened during execution but that do not affect functionality
     private static final PlatformLogger logger = PlatformLogger.getLogger("sun.lwawt.macosx.CPlatformWindow");
@@ -593,7 +594,7 @@
             }
         }
 
-        nativeSynthesizeMouseEnteredExitedEvents(nsWindowPtr);
+        nativeSynthesizeMouseEnteredExitedEvents();
 
         // Configure stuff #2
         updateFocusabilityForAutoRequestFocus(true);
@@ -738,6 +739,9 @@
         setStyleBits(ALWAYS_ON_TOP, isAlwaysOnTop);
     }
 
+    public PlatformWindow getTopmostPlatformWindowUnderMouse() {
+        return CPlatformWindow.nativeGetTopmostPlatformWindowUnderMouse();
+    }
     @Override
     public void setOpacity(float opacity) {
         CWrapper.NSWindow.setAlphaValue(getNSWindowPtr(), opacity);
@@ -830,7 +834,7 @@
                 throw new RuntimeException("Unknown window state: " + windowState);
         }
 
-        nativeSynthesizeMouseEnteredExitedEvents(nsWindowPtr);
+        nativeSynthesizeMouseEnteredExitedEvents();
 
         // NOTE: the SWP.windowState field gets updated to the newWindowState
         //       value when the native notification comes to us