Hi Thomas Mutzl,
Using the technique demonstrated in this online example
should help you achieve the desired result.
Generally you can place data fields in any container , and achieve any layout setting the three templates - the ReadOnlyTemplate, the NewItemTemplate and the EditTemplate.
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