[9] Review request for 8041561 Inconsistent opacity behaviour between JCheckBox and JRadioButton

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8041561
  webrev: http://cr.openjdk.java.net/~alexsch/8041561/webrev.00

  The fix does not paint JRadioButton Metal icon interior if the radio 
button is not opaque.

Thanks,
Alexandr.