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I have prepared a sample project which demonstrates how you could show and hide StackPanels with transition. Note that RadTransitionControl is a ContentControl which plays the animation when its Content is changed - that's why I use binding to update its Content and a Converter to switch the Visibility of the StackPanels.
I would also suggest to check how RadTransitionControl can be used with Navigation Framework in this online example
- generally this approach is better, but is suitable only in cases when the controls in the different StackPanels are independent.
Hope this helps. If you have any additional questions, please let us know.
the Telerik team