Erwin, thank you for the suggestion.
, indeed, we fixed a similar issue in Q3 SP1. I recommend you to download and try the new version. We will highly appreciate any feedback you have.
If the issue appears in the new release, please send us a sample project and give more details on the exact situation.
I will be glad to help you further.
All the best,
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.