You have to map external template for the control or view you are using. For instance for GenericContent control that you can drop on a page the template is GenericContentControlDesigner.ascx
If you want to do this for GenericContent module
, there are two templates that you have to map - ContentNewsView and ContentEditView which are used when you create a new item and edit an existing item
You can follow this KB - How to map a template
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