We already had some similar requests. In the upcoming beta you will have TransitionStatusChanged event that will report for 3 status updates: Started, Interrupted and Completed pretty much explain themselves while the Interrupted is the case where a second transition starts before the previous has completed. Also a boolean property IsTransitionIdle would be exposed that gets false while a transition is playing. It would be very handy to bind the IsEnabled of some elements so they won't be clickable during animations.
We have also some additional API changes that would alow for better layout changing transitions. That is when the size of the new content differ the previous.
We would like to encourage you test the beta release once it goes public. We are really excited about these new features so any feedback would be greatly appreciated.
the Telerik team
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