[OS X Accessibility] JComboBox works very strange with Voice Over

1) There is no way to show & spell all items of combobox (non editable & editable) if a popup has scroll and is not fully shown. Voice Over can read only items from first to last visible (first getMaximumRowCount() items of combobox)

2)Voice over black rectangle and swing component selected item are not synchronized - one item is spelled and another is selected. Ctrl-Opt-arrow moves only Voice Over selection and does not move component selection.
If I use arrow keys without Ctrl-Opt component selection is changed, but Voice Over rectangle stay on old place and first item of popup list is spelled even if it is not in black rect. It looks VERY STRANGE.

3)Ctrl-Opt-Space is recommended by Voice Over as a shortcut to show a popup list but it does not work. For editable Arrow-down works and for non-editable - space. Ctrl-Opt-Spacesometimes moves focus to next component, sometimes - do nothing.

I tested jdk 8u40b08 on Mac OS X 10.9 iMac