/**
* Return items that have this project object as parent (first level only)
*
* This function will order subitems by position and ID by default, but it
* can be overriden in subclasses
*
* If $type is used ProjectObject type will be used
*
* @param void
* @return array
*/
function &getSubitems()
{
if ($this->subitems === false) {
$this->subitems = ProjectObjects::findByParent($this, null, 'position, id');
}
// if
return $this->subitems;
}