Calendar::showMassiveActionsSubForm PHP Method

    static function showMassiveActionsSubForm(MassiveAction $ma)
    {
        switch ($ma->getAction()) {
            case 'duplicate':
                Entity::dropdown();
                echo "<br><br>";
                echo Html::submit(_x('button', 'Duplicate'), array('name' => 'massiveaction')) . "</span>";
                return true;
            case 'addholiday':
                Holiday::dropdown();
                echo "<br><br>";
                echo Html::submit(_x('button', 'Add'), array('name' => 'massiveaction')) . "</span>";
                return true;
        }
        return parent::showMassiveActionsSubForm($ma);
    }