Constructs a SetDialogOptionCommand object.
string $selector: The selector of the dialog whose title will be set. If set to an empty value, the default modal dialog will be selected.
string $option_name: The name of the option to set. May be any jQuery UI dialog option. See http://api.jqueryui.com/dialog.
mixed $option_value: The value of the option to be passed to the dialog.
public function __construct($selector, $option_name, $option_value) {
$this->selector = $selector ? $selector : '#drupal-modal';
$this->optionName = $option_name;
$this->optionValue = $option_value;
}