--- old/src/share/classes/com/sun/java/swing/plaf/windows/WindowsRootPaneUI.java	Fri Oct 26 21:01:37 2012
+++ new/src/share/classes/com/sun/java/swing/plaf/windows/WindowsRootPaneUI.java	Fri Oct 26 21:01:37 2012
@@ -31,6 +31,8 @@
 import java.awt.KeyEventPostProcessor;
 import java.awt.Window;
 import java.awt.Toolkit;
+
+import sun.awt.AWTAccessor;
 import sun.awt.SunToolkit;
 
 import java.awt.event.ActionEvent;
@@ -138,6 +140,13 @@
                 if (tk instanceof SunToolkit) {
                     skip = ev.getWhen() <= ((SunToolkit)tk).getWindowDeactivationTime(winAncestor);
                 }
+                // We must insure that original source of key event belongs to the same window object as winAncestor.
+                if (!skip) {
+                    Component originalSource = AWTAccessor.getKeyEventAccessor()
+                            .getOriginalSource(ev);
+                    skip = !(originalSource == winAncestor ||
+                            SwingUtilities.getWindowAncestor(originalSource) == winAncestor);
+                }
 
                 if (menu != null && !skip) {
                     MenuElement[] path = new MenuElement[2];
--- old/src/share/classes/java/awt/event/KeyEvent.java	Fri Oct 26 21:01:40 2012
+++ new/src/share/classes/java/awt/event/KeyEvent.java	Fri Oct 26 21:01:39 2012
@@ -930,6 +930,10 @@
                                                long extendedKeyCode) {
                     ev.extendedKeyCode = extendedKeyCode;
                 }
+
+                public Component getOriginalSource( KeyEvent ev ) {
+                    return ev.originalSource;
+                }
             });
     }
 
@@ -939,10 +943,19 @@
      */
     private static native void initIDs();
 
+    /**
+     * The original event source.
+     *
+     * Event source can be changed during processing, but in some cases
+     * we need to able to obtain original source.
+     */
+    private Component originalSource;
+
     private KeyEvent(Component source, int id, long when, int modifiers,
                     int keyCode, char keyChar, int keyLocation, boolean isProxyActive) {
         this(source, id, when, modifiers, keyCode, keyChar, keyLocation);
         this.isProxyActive = isProxyActive;
+        originalSource = source;
     }
 
     /**
@@ -1023,6 +1036,7 @@
         } else if ((getModifiers() == 0) && (getModifiersEx() != 0)) {
             setOldModifiers();
         }
+        originalSource = source;
     }
 
     /**
@@ -1069,6 +1083,7 @@
                     int keyCode, char keyChar) {
         this(source, id, when, modifiers, keyCode, keyChar,
           KEY_LOCATION_UNKNOWN);
+        originalSource = source;
     }
 
     /**
@@ -1078,6 +1093,7 @@
     public KeyEvent(Component source, int id, long when, int modifiers,
                     int keyCode) {
         this(source, id, when, modifiers, keyCode, (char)keyCode);
+        originalSource = source;
     }
 
     /**
--- old/src/share/classes/sun/awt/AWTAccessor.java	Fri Oct 26 21:01:42 2012
+++ new/src/share/classes/sun/awt/AWTAccessor.java	Fri Oct 26 21:01:41 2012
@@ -629,6 +629,11 @@
          * Sets extendedKeyCode field for KeyEvent
          */
         void setExtendedKeyCode(KeyEvent ev, long extendedKeyCode);
+
+        /**
+         * Gets original source for KeyEvent
+         */
+        Component getOriginalSource(KeyEvent ev);
     }
 
     /**