/**
* Writes a common 'unpublish' button.
*
* @param string $task An override for the task.
* @param string $alt An override for the alt text.
* @param boolean $check True if required to check that a standard list item is checked.
*
* @return void
*
* @since 1.5
*/
public static function unpublish($task = 'unpublish', $alt = 'JTOOLBAR_UNPUBLISH', $check = false)
{
$bar = Toolbar::getInstance('toolbar');
// Add an unpublish button
$bar->appendButton('Standard', 'unpublish', $alt, $task, $check);
}