[Accessibility, Mac] VoiceOver reads items incorrectly when ListView scrolled.

JFX build: 8u40 b12
Steps to reproduce:
1. Start VoiceOver on Mac OS X 10.9.5
2. Run HelloSimpleListView
3. Select "JavaFX item 0", then press down arrow untill "JavaFX item 17" is selected.

Bug: when "JavaFX item 17" is selected, VoiceOver reads "blank"

I guess this might be related to the ScrollPane. And TableView, TreeView have similar problem when they are scrolled.