public function getCustomSections($strKey=null)
	{
		@trigger_error('Using FrontendTemplate::getCustomSections() has been deprecated and will no longer work in Contao 5.0. Use FrontendTemplate::sections() instead.', E_USER_DEPRECATED);

		if ($strKey != '' && !isset($this->positions[$strKey]))
		{
			return '';
		}

		$tag = 'div';

		// Use the section tag for the main column
		if ($strKey == 'main')
		{
			$tag = 'section';
		}

		$sections = '';

		// Standardize the IDs (thanks to Tsarma) (see #4251)
		foreach ($this->positions[$strKey] as $sect)
		{
			if (isset($this->sections[$sect['id']]))
			{
				$sections .= "\n" . '<' . $tag . ' id="' . StringUtil::standardize($sect['id'], true) . '">' . "\n" . '<div class="inside">' . "\n" . $this->sections[$sect['id']] . "\n" . '</div>' . "\n" . '</' . $tag . '>' . "\n";
			}
		}

		if ($sections == '')
		{
			return '';
		}

		return '<div class="custom">' . "\n" . $sections . "\n" . '</div>' . "\n";
	}