The issue is discovered in JDK-8316274

example of not displayed captions with
https://bugs.openjdk.org/secure/attachment/106474/window.png

how it should look like:
https://bugs.openjdk.org/secure/attachment/116609/toggleButtonsWithCaptions.png

Affects at least Metal, Nimbus, Motif and GTK LaFs

Note that the toggle buttons in window.png do not display captions 1 and 2.

However, the captions appear when I replace toggleButton.setAction with addActionListener ( see toggleButtonsWithCaptions.png, or run `java TestButtonGroupFocusTraversal.java 1`)

https://bugs.openjdk.org/secure/attachment/116610/TestButtonGroupFocusTraversal.java