I am afraid that we were unable to replicate the issue you are describing.
Would you please modify the attached project so that it replicates the issue and send it back to us in an official support ticket, excluding the Bin folder content? Thus, we would be able to investigate locally and help you more efficiently.
We would greatly appreciate a screencast demonstrating the steps for reproduction of the issue.
To run the project, you should just place the NET 4.5 version of the Telerik assemblies in the bin folder.
Once we have closure in the support ticket, we can share it here for convenience and better visibility from the community.