Sorry for the delayed reply!
Can you share more details on the error you get when you try to define the MediaPlayer in Xaml? Is this in some kind of View which is loaded dynamically? Can you send us a sample Xaml that crashed for you? I am asking for all this because the MediaPlayer should just work when defined in xaml.
Unfortunately there are no events that you can handle to implement the skip-forward and skip-backward feature. Currently the buttons will only go to the previous and next chapters. Even if you were able to get to the Click events on the buttons, they would still switch the chapters.
As a workaround I can suggest to add chapters to the MediaItems.
We are planning to add commands to the MediaPlayer that will let you customize the behavior of the buttons, but unfortunately I do not know when they will be implemented.
the Telerik team