--- old/src/macosx/classes/sun/lwawt/LWWindowPeer.java	2012-04-27 16:08:51.000000000 +0400
+++ new/src/macosx/classes/sun/lwawt/LWWindowPeer.java	2012-04-27 16:08:50.000000000 +0400
@@ -409,6 +409,12 @@
         synchronized (getPeerTreeLock()) {
             this.blocker = blocked ? (LWWindowPeer)blocker.getPeer() : null;
         }
+        
+        if (blocked) {
+            platformWindow.modallyBlocked();
+        } else {
+            platformWindow.modallyUnblocked();
+        }
     }
 
     @Override