code: public function getAttributes($arrStrip=array())
  	{
  		// The "required" attribute only makes sense for single checkboxes
  		if (\count($this->arrOptions) == 1 && $this->mandatory)
  		{
  			$this->arrAttributes['required'] = 'required';
  		}
  
  		return parent::getAttributes($arrStrip);
  	}
docs: Return all attributes as string
  
  @param array $arrStrip An optional array with attributes to strip
  
  @return string The attributes string