Occurs when a control starts transitioning to a different state.
Assembly: PresentationFramework (in PresentationFramework.dll)
The event occurs when the control begins to transition states. If a VisualTransition is applied to the state change, this event occurs when the transition begins. If a VisualTransition is not applied, this event occurs after the control transitions to the new state, but before the CurrentStateChanged event.
Available since 4.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0