src/java.desktop/macosx/classes/com/apple/laf/AquaTabbedPaneUI.java

*** 843,853 ****
          }
  
          boolean isDefaultFocusReceiver(final JComponent component) {
              if (isDefaultFocusReceiver == null) {
                  Component defaultFocusReceiver = KeyboardFocusManager.getCurrentKeyboardFocusManager().getDefaultFocusTraversalPolicy().getDefaultComponent(getTopLevelFocusCycleRootAncestor(component));
!                 isDefaultFocusReceiver = new Boolean(defaultFocusReceiver != null && defaultFocusReceiver.equals(component));
              }
              return isDefaultFocusReceiver.booleanValue();
          }
  
          Container getTopLevelFocusCycleRootAncestor(Container container) {
--- 843,853 ----
          }
  
          boolean isDefaultFocusReceiver(final JComponent component) {
              if (isDefaultFocusReceiver == null) {
                  Component defaultFocusReceiver = KeyboardFocusManager.getCurrentKeyboardFocusManager().getDefaultFocusTraversalPolicy().getDefaultComponent(getTopLevelFocusCycleRootAncestor(component));
!                 isDefaultFocusReceiver = defaultFocusReceiver != null && defaultFocusReceiver.equals(component);
              }
              return isDefaultFocusReceiver.booleanValue();
          }
  
          Container getTopLevelFocusCycleRootAncestor(Container container) {