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

@@ -413,11 +413,13 @@
             g.setColor(b.getForeground());
         } else {
             /*** paint the text disabled ***/
             g.setColor(defaultDisabledTextColor);
         }
-        SwingUtilities2.drawStringUnderlineCharAt(c, g, text, mnemonicIndex, localTextRect.x, localTextRect.y + fm.getAscent());
+        getTextUIDrawing().drawStringUnderlineCharAt(c, g, text, mnemonicIndex,
+                                                     localTextRect.x,
+                                                     localTextRect.y + fm.getAscent());
     }
 
     protected void paintText(final Graphics g, final AbstractButton b, final Rectangle localTextRect, final String text) {
         paintText(g, (JComponent)b, localTextRect, text);
     }