private function getValue($field, $prefix = null) {

		foreach($this -> combine as $combine) {
			
			if($combine -> getName() === $field) {
				return $combine -> combine();
			}
		}

		//Prefix
		if(null !== $prefix) {
			$field = $prefix . '[' . $field . ']';
		}

		//Get the value
		$helper = new StringToArray();
		$data 	= $helper -> execute($field, null, $this -> getData());

		return $data;
	}