Nette\Forms\Form::removeGroup PHP Method

    public function removeGroup($name)
    {
        if (is_string($name) && isset($this->groups[$name])) {
            $group = $this->groups[$name];
        } elseif ($name instanceof ControlGroup && in_array($name, $this->groups, TRUE)) {
            $group = $name;
            $name = array_search($group, $this->groups, TRUE);
        } else {
            throw new Nette\InvalidArgumentException("Group not found in form '{$this->name}'");
        }
        foreach ($group->getControls() as $control) {
            $control->getParent()->removeComponent($control);
        }
        unset($this->groups[$name]);
    }