--- old/src/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2012-01-31 21:41:37.000000000 +0300
+++ new/src/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2012-01-31 21:41:37.000000000 +0300
@@ -604,8 +604,9 @@
     public void setOpaque(boolean isOpaque) {
         CWrapper.NSWindow.setOpaque(getNSWindowPtr(), isOpaque);
         if (!isOpaque) {
-            long clearColor = CWrapper.NSColor.clearColor();
-            CWrapper.NSWindow.setBackgroundColor(getNSWindowPtr(), clearColor);
+            float[] bgValues = target.getBackground().getComponents(null);
+            CWrapper.NSWindow.setBackgroundColor(getNSWindowPtr(),
+                          bgValues[0], bgValues[1], bgValues[2], bgValues[3]);
         }
     }