public static function addSubmenu($extension)
	{
		// Avoid nonsense situation.
		if ($extension == 'com_categories')
		{
			return;
		}

		$parts = explode('.', $extension);
		$component = $parts[0];

		if (count($parts) > 1)
		{
			$section = $parts[1];
		}

		// Try to find the component helper.
		$eName = str_replace('com_', '', $component);
		$file = JPath::clean(JPATH_ADMINISTRATOR . '/components/' . $component . '/helpers/' . $eName . '.php');

		if (file_exists($file))
		{
			require_once $file;

			$prefix = ucfirst(str_replace('com_', '', $component));
			$cName = $prefix . 'Helper';

			if (class_exists($cName))
			{
				if (is_callable(array($cName, 'addSubmenu')))
				{
					$lang = JFactory::getLanguage();

					// Loading language file from the administrator/language directory then
					// loading language file from the administrator/components/*extension*/language directory
					$lang->load($component, JPATH_BASE, null, false, true)
					|| $lang->load($component, JPath::clean(JPATH_ADMINISTRATOR . '/components/' . $component), null, false, true);

					call_user_func(array($cName, 'addSubmenu'), 'categories' . (isset($section) ? '.' . $section : ''));
				}
			}
		}
	}