yii: specify per module theme

TestModule.php

<?php
class TestModule extends CWebModule
{
  public function init()
	{
		$this->setImport(array(
			'tmp.models.*',
			'tmp.components.*',
		));
	
    		//add this line to here to specify per module theme!
		Yii::app()->theme = 'selected-theme-name';
	
		//register assets used in this module only
		$this->register('example.css');
		$this->register('scroll.css');
		$this->register('scroll.js');
	
	}
	
	// ...
	
	
	public static function register($file)
	{
		//could be module's assets path, in this case use vendor's assets as is
		$assets_path_css = 'application.vendor.scrolljs.css';
		$assets_path_js = 'application.vendor.scrolljs.js';
		
		if(strpos($file, 'js') !== false){
		
			$url = Yii::app()->getAssetManager()->publish(
			Yii::getPathOfAlias($assets_path_js));
			$path = $url . '/' . $file;
			return Yii::app()->clientScript->registerScriptFile($path);
			
		}else if(strpos($file, 'css') !== false){

			$url = Yii::app()->getAssetManager()->publish(
				Yii::getPathOfAlias($assets_path_css));
			$path = $url . '/' . $file;
			return Yii::app()->clientScript->registerCssFile($path);
		}

		return $path;
	}	
	
}
?>