Unfortunately this is not supported by the news archive control. In order to achieve this it would be easier for you if you would create a custom control for this. A similar discussion and some suggestions can be found here
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