[BUG #7710] added contains method
[BUG #7710] fixed focus handling
[BUG #7710] added keyboard controls for rating
[BUG #7710] attach key listener to knob
[BUG #7710] added keyboard controls for tabs
[BUG #7710] enabled useCapture for event listeners
[BUG #7710] attach key listener to list child
[BUG #7710] add default tabindex
[BUG #7710] display demo code