public function & AddCssClasses ($cssClasses) {
		/** @var $this \MvcCore\Ext\Forms\IField */
		$cssClassesArr = gettype($cssClasses) == 'array'
			? $cssClasses
			: explode(' ', (string) $cssClasses);
		$this->cssClasses = array_merge($this->cssClasses, $cssClassesArr);
		return $this;
	}