function delete() {
		// delete system permissions
		SystemPermissions::delete("`permission_group_id` = ".$this->getId());
		// delete member permissions
		ContactMemberPermissions::delete("`permission_group_id` = ".$this->getId());
		// delte dimension permissions
		ContactDimensionPermissions::delete("`permission_group_id` = ".$this->getId());
		// delete contact_permission_group entries
		ContactPermissionGroups::delete("`permission_group_id` = ".$this->getId());
		// delete tab panel permissions
		TabPanelPermissions::delete("`permission_group_id` = ".$this->getId());
		
		parent::delete();
	}
 /**
  * Returns a peer instance associated with this om.
  *
  * Since Peer classes are not to have any instance attributes, this method returns the
  * same instance for all member of this class. The method could therefore
  * be static, but this would prevent one from overriding the behavior.
  *
  * @return     PermissionGroupPeer
  */
 public function getPeer()
 {
     if (self::$peer === null) {
         self::$peer = new PermissionGroupPeer();
     }
     return self::$peer;
 }