/**
  * Reorder method.
  *
  * Reorders the nodes (and child nodes) of the tree according to the field and direction specified in the parameters.
  * This method does not change the parent of any node.
  *
  * If the id parameter is not given the scope parameter is required to make this work on scoped trees.
  * 
  * Requires a valid tree, by default it verifies the tree before beginning.
  *
  * Options:
  *
  * - 'id' id of record to use as top node for reordering
  * - 'field' Which field to use in reordeing defaults to displayField
  * - 'order' Direction to order either DESC or ASC (defaults to ASC)
  * - 'verify' Whether or not to verify the tree before reorder. defaults to true.
  * - 'scope' Manually set the scope to reorder the tree on.
  *
  * @param AppModel $Model Model instance
  * @param array $options array of options to use in reordering.
  * @return boolean true on success, false on failure
  * @link http://book.cakephp.org/view/1355/reorder
  * @link http://book.cakephp.org/view/1629/Reorder
  */
 public function reorder($Model, $options = array())
 {
     if ($this->scoped($Model)) {
         if (empty($options[$Model->primaryKey]) && empty($options['scope'])) {
             return false;
         }
         if (!empty($options[$Model->primaryKey])) {
             $scope = $this->__getScopeFromid($Model, $options[$Model->primaryKey]);
         } else {
             $scope = $options['scope'];
         }
         $this->__setScope($Model, $scope);
     }
     return parent::reorder($Model, $options);
 }