constructor(properties) {
    super(properties);
    this.childProps = sanitizeChildProps(properties);
  }
ActionArea

The purpose of this component is to provide a button like behaviour for a
click like interaction within other components. Button can't be used in such
cases as it always will have it's own focus which is not desired in
components like DatePicker e.g. next month button.

Note: Use the ActionArea's onUpdate instead of onClick as otherwise on iOS9
the ActionArea will trigger onFocus for it's parent with a set tabindex.