The demo seems to work fine for me and I am attaching here a short video that demonstrates this.
Can you confirm all network requests return successfully on your end? Our demos use the CDN we have to download the controls' scripts and stylesheets from the cloud, so if you have a connectivity issue with the Amazon Cloud, you may not get all needed requests and thus, the demo could fail for you.
What I can suggest is the following:
- Implement the simplest selection scenario, because the demo has some additional code to make it prettier and to mimic a real-life scenario. It is not likely that you need that exact code, so you can start from the basics: http://www.telerik.com/help/aspnet-ajax/tilelist-selection.html.
- If you want to examine the demo, download its source code from your account and run it locally. This will let you use webresource requests instead of going to the cloud, so there should be no issues.