Occurs when a control starts transitioning to a different state.
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
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.