resolveChild example

return $this->getFormFactory()->createBuilderForProperty($this->getDataClass(), $name, null, $options);
    }

    public function get(string $name): FormBuilderInterface
    {
        if ($this->locked) {
            throw new BadMethodCallException('FormBuilder methods cannot be accessed anymore once the builder is turned into a FormConfigInterface instance.');
        }

        if (isset($this->unresolvedChildren[$name])) {
            return $this->resolveChild($name);
        }

        if (isset($this->children[$name])) {
            return $this->children[$name];
        }

        throw new InvalidArgumentException(sprintf('The child with the name "%s" does not exist.', $name));
    }

    public function remove(string $name): static
    {