src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m

@@ -262,10 +262,15 @@
         } else {
             [self.nsWindow setCollectionBehavior:NSWindowCollectionBehaviorDefault];
         }
     }
 
+    if (IS(self.styleBits, DARK_TITLE_BAR)) {
+        [self.nsWindow setAppearance:[NSAppearance appearanceNamed:NSAppearanceNameVibrantDark]];
+    } else {
+        [self.nsWindow setAppearance:[NSAppearance appearanceNamed:NSAppearanceNameVibrantLight]];
+    }    
 }
 
 - (id) initWithPlatformWindow:(JNFWeakJObjectWrapper *)platformWindow
                   ownerWindow:owner
                     styleBits:(jint)bits