1. Open KitchenSink & expand the 'Lists' Rollup
(Start with org.apache.pivot.wtk.debugfocus=true system property to see highlighting as per attached screenshots)
2. Click anywhere on the 'Basic' ListButton to display the full list
3. Click anywhere on the 'Image' ListButton to display the full list
Focus transfers to the 'Image' ListButton's list, but then quickly transfers again to the 'Basic' ListButton
4. (With the 'Image' ListButton still expanded)
Press the down arrow key to change the selected value for 'Basic' from 'Color' to 'Red'
The same happens if you select the Image ListButton before the Basic one.