message: Hide status bar on visible->hidden transition
diff: @@ -169,8 +169,10 @@ module.exports = React.createClass({
  // Check whether current size is greater than 0, if yes call props.onVisible
  _checkSize: function() {
  - if (this.props.onVisible && this._getSize()) {
  - this.props.onVisible();
  + if (this._getSize()) {
  + if (this.props.onVisible) this.props.onVisible();
  + } else {
  + if (this.props.onHidden) this.props.onHidden();
  }
  },
  