<Swing Dev> Review Request for 8033699: Incorrect radio button behavior

[Vivi An]

Hello,

Please review fix for JDK-8033699.  Changes made:
1) When tab or shift-tab key pressed,  focus moved to next/previous 
component outside of the radio button group
2) Using up/down or left/right arrow key to change selection inside 
radio button group

Bug: https://bugs.openjdk.java.net/browse/JDK-8033699
Webrev: http://cr.openjdk.java.net/~van/8033699/webrev.00/

JCK tests for JRadiobutton and JCheckBox all passed.

Thank you

Regards,

Vivi