SilverStripe: Switching template in custom controller using GET variable.

gistfile1.php

<?php
class MyController extends ContentController {

    private static $allowed_actions = array(
    	'myaction',
    	'myotheraction'
    );
    //A deafult template named the same as the controller as a fall back.
    private static $template = "MyController"; 

    public function init(){
        parent::init();
		$version = $this->request->getVar('version');
		if(isset($version)) {
			switch($this->request->getVar('version')){
				case 1:
					//set the template using SilverStripe 3 config system. It changes tha value of the static.
					$this->config()->template = "ShowCase1"; 
					break;
				case 2:
					$this->config()->template = "ShowCase2";
					break;
			}
		}
	}

	public function myaction(SS_HTTPRequest $request){
		$data = array(
			"Title" => "Pass variable to template",
			"Content" => $this->config()->template //output template for debug
			);
			//use the config system to get the value of the template. Note, 'Page' is the fallback template.
			return $this->renderWith(array($this->config()->template, "Page"),$data); 

	}


	public function myotheraction(SS_HTTPRequest $request){
		//should be available in all actions on a controller.
		return $this->renderWith(array($this->config()->template, "Page")); 
	}

}