src/java.desktop/share/classes/javax/swing/plaf/metal/MetalToggleButtonUI.java

@@ -210,11 +210,11 @@
                 g.setColor(c.getBackground());
             } else {
                 g.setColor(getDisabledTextColor());
             }
         }
-        SwingUtilities2.drawStringUnderlineCharAt(c, g, text, mnemIndex,
+        getTextUIDrawing().drawStringUnderlineCharAt(c, g, text, mnemIndex,
                 textRect.x, textRect.y + fm.getAscent());
     }
 
     protected void paintFocus(Graphics g, AbstractButton b,
                               Rectangle viewRect, Rectangle textRect, Rectangle iconRect){