/**
* Define optional properties.
*/
protected function optional()
{
return array_merge(parent::optional(), array('preferredStartingPosition'));
}
/**
* Define optional properties.
*/
protected function optional()
{
return array_merge(parent::optional(), array('initialAlpha', 'userControllable'));
}
/**
* Define optional properties.
*/
protected function optional()
{
return array_merge(parent::optional(), array('initialAlpha', 'initialScale'));
}