Do you mean the slide animation of the demos application? It could be created by 2 ContentPresenters and a storyboard with 3 animations - one for zoom-out of the first content presenter, one for slide and one for zoom in of the second content presenter. Unfortunately I cannot send you our code as it is tightly coupled with our application.
We are currently working on a control that will deliver this feature out-of-the-box and it will be available for Beta1 and for the Q1 release.
All the best,
the Telerik team