public function AddGroupLabelCssClasses ($groupLabelCssClasses) {
		/** @var $this \MvcCore\Ext\Forms\IField */
		if (gettype($groupLabelCssClasses) == 'array') {
			$groupCssClasses = $groupLabelCssClasses;
		} else {
			$groupCssClasses = explode(' ', (string) $groupLabelCssClasses);
		}
		$this->groupLabelCssClasses = array_merge($this->groupLabelCssClasses, $groupCssClasses);
		return $this;
	}