There is a specifics in our distribution model that could have caused the problem. It is that the WPF 3.5 assemblies and the WPF 4.0 ones get distributed through different installers. Thus, if you have RadControls for WPF 3.5 installed and you try to create a Telerik WPF project, targeting .NET 4.0, the RadControls dropdown won't be populated. The opposite (RadControls for WPF 4.0 installed, trying to create a project, targeting .NET 3.5) is true as well.
Can you check if this is the problem on your side? If yes, you could either install the RadControls for WPF installer, targeting the framework your project utilizes, or you can change the TargetFramework of your project.
The other option (better yet), is that you download the RadControls for WPF hotfix distributions (for both WPF 3.5 and WPF 4.0) and extract them in an own folder each under the following path: %appdata%\Telerik\Updates
. This is the path the VSExtensions download the RadControls assemblies to.
I'm sorry for the inconvenience. The problem won't exist starting the Q3 2011 release anymore for we'll have the WPF 3.5 and WPF 4.0 assemblies distributed via a single installer.
Let me know if that helps
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>