Hi Boudewijn van Veen,
We apologize for the inconvenience but this is no longer possible. We changed this behavior based on customer feedback. The picture in our help article is quite old and we will update it to clear up confusion.
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.