[Solved] Missing 'CacheBase' after update to 2011-2

[Andreas]

After Update from Telerik.Web.MVC Version 2010-2 to Telerik.Web.MVC Version 2011-2 for MVC 2 I get an error.
The error states that CacheBase (and GetOrCreate) cannot be found.
Thanks in advance for any help.

Herer is a code snippet:

using Telerik.Web.Mvc.Extensions;
using Telerik.Web.Mvc.Infrastructure;

class PropertyCache : CacheBase<string, PropertyInfo>
{
    public PropertyInfo GetProperty(Type type, string key)
    {
        Guard.IsNotNull(type, "type");
        Guard.IsNotNullOrEmpty(key, "key");

        Func<PropertyInfo, bool> canInclude = property => CreateMatchingGet(property)();

        return GetOrCreate(key, () => { return type.GetProperty(key, BindingFlags.Public | BindingFlags.Static | BindingFlags.GetProperty); });
    }

[Andreas]

I put the thread into "General Discussions - this ("Installer and VS Extensions") is simply the wrong place for my question.