Thank you for getting back to us.
As we have mentioned previously in the thread support for .NET 4.0 will come with a later release. You will not be able to successfully run the Beta in .NET 4.0.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items