code: protected function getAssetsUrl()
  	{
  		if (!isset($this->_assetsUrl))
  		{
  			$path = dirname(__FILE__) . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . 'assets';
  			$this->_assetsUrl = Yii::app()->assetManager->publish($path, false, -1, $this->forceCopyAssets);
  		}
  		
  		return $this->_assetsUrl;
  	}
docs: Returns the URL to the published assets folder.
  @return string the URL