public function add(array $properties, Closure $callback = null)
    {
        $this->makeSubItem(null, $properties, $callback);
    }
public function add(array $properties, Closure $callback = null)
    {
        $this->makeSubItem(null, $properties, $callback);
    }
public function add ( array $ properties , Closure $ callback = null ) { $ this -> makeSubItem ( null , $ properties , $ callback ) ; }
Add an item to the parent.

@param  array     $properties
@param  \Closure  $callback
Add an item to the parent .