--- old/src/java.desktop/macosx/classes/com/apple/laf/AquaComboBoxUI.java	2014-11-19 15:02:09.000000000 +0400
+++ new/src/java.desktop/macosx/classes/com/apple/laf/AquaComboBoxUI.java	2014-11-19 15:02:09.000000000 +0400
@@ -496,10 +496,15 @@
     // This is somewhat messy.  The difference here from BasicComboBoxUI.EnterAction is that
     // arrow up or down does not automatically select the
     @SuppressWarnings("serial") // anonymous class
-    private static final Action triggerSelectionAction = new AbstractAction() {
+    private final Action triggerSelectionAction = new AbstractAction() {
         public void actionPerformed(final ActionEvent e) {
             triggerSelectionEvent((JComboBox)e.getSource(), e);
         }
+
+        @Override
+        public boolean isEnabled() {
+            return comboBox.isPopupVisible() && super.isEnabled();
+        }
     };
 
     @SuppressWarnings("serial") // anonymous class