In JreFindDialog, hotkey (Alt+N) is not working for Next button

Tested OS : Windows, Solaris
Tested Build : mustang b78

Steps to reproduce :

1. Install mustang b78
2. Launch java control panel
3. Go to java tab
4. click view button of JNLP Runtime settings
5. Press find button
6. click next
In the JRE Finder dialog, Alt+N is not working for Next button.
In the same dialog, Alt+C (for Cancel) and Alt+P (for Previous) are working fine